| 1. |
- Ahrenby, Hanna, 1978-
(författare)
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Värdegrundsarbete i bildundervisning : en studie om iscensättning av policy i grundskolans senare år
- 2021
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The overall purpose of this thesis is to describe and discuss preconditions for the enactment and the construction of fundamental values in art education in secondary school. The study is based on ethnographic methods, including classroom observations, video recordings and interviews with art teachers and pupils. Three art teachers and 36 pupils in grade eight and nine (age 14-16) have participated in the study. The schools are located in areas of different socio-economic status. Besides interviews, the empirical material consists of observation notes, video and sound recordings, documents and photographs from the observed lessons. In total, 27 lessons were observed and recorded, 20 interviews with teachers and seven interviews with pupils were conducted. The empirical material is analysed with a combination of policy enactment theory (Ball et al. 2012) and concepts form Bernstein (2000, 2003) and Bakhtin (1981, 1986).The analysis reveals that the conditions for policy enactment are created by several factors that interact. It is impossible to designate a single factor to explain why the enacted curriculum turns out the way it does. The contextual dimensions, such as material context, situated context, professional culture and external context (Ball et al. 2012), constitute a complex and unique contextual mix in every school. Together with existing subject traditions and teaching practices in art education, the unique contextual mix creates the conditions for enacting the fundamental values in art education.The art subject carries a tradition of image-making that pushes more theoretical syllabus content,such as image analysis, aside. The situated context influences the professional culture and, therefore,they function as a lens for selecting and translating the curriculum. Regardless of teachers' intentionsto enact the fundamental values in art education, the external context can create obstacles. The goal and result management of school leads to a focus on measurable subject knowledge and drive awayother curriculum parts such as the fundamental values, making it challenging to work with fundamental values in Art education.In conclusion, there are no prerequisites for realising the intentions of the fundamental values as expressed in the curriculum. Despite this, the fundamental values have a given place in Art education. Although, it is not always expressed verbally; instead, it is image-borne.
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| 2. |
- Arroyo Mühr, Laila Sara, et al.
(författare)
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Does human papillomavirus-negative condylomata exist?
- 2015
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Ingår i: Virology. - : Elsevier BV. - 1096-0341 .- 0042-6822. ; 485, s. 283-288
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Tidskriftsartikel (refereegranskat)abstract
- Condylomata acuminata is caused by human papillomavirus (HPV). PCR with consensus primers will typically detect HPV in >96% of condylomata. Metagenomic sequencing has found that some "HPV-negative" condylomata do indeed contain HPV. We wished to perform a renewed evaluation of the "HPV-negative" condylomata using deeper metagenomics sequencing. Sequencing of whole genome amplified DNA from 40 apparently "HPV-negative" condylomata detected HPV in 37/40 specimens. We found 75 different HPV types, out of which 43 represented novel putative HPV types. Three types were cloned and established as HPV types 200, 201 and 202. Molluscum contagiosum virus was detected in 24 of the 40 samples. In summary, deep sequencing enables detection of HPV in almost all condylomata. "HPV-negative" condylomata might largely be explained by clinical misdiagnosis or the presence of viral variants, distantly related HPV types and/or low viral loads.
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| 3. |
- Galanti, Maria Rosaria, et al.
(författare)
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School environment and mental health in early adolescence - a longitudinal study in Sweden (KUPOL)
- 2016
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Ingår i: BMC Psychiatry. - : Springer Science and Business Media LLC. - 1471-244X. ; 16
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Tidskriftsartikel (refereegranskat)abstract
- Background: Longitudinal studies indicate strong associations between school proficiency and indicators of mental health throughout adulthood, but the mechanisms of such associations are not fully elucidated. The Kupol study is a prospective cohort study in Sweden set up in order to: (i) describe the association of school pedagogic and social environment and its specific dimensions with the risk of mental ill-health and psychiatric disorders in adolescence; (ii) evaluate the direct effects of school pedagogic and social environment on mental health and the effects mediated by the individual's academic achievements; and (iii) assess if school pedagogic and social environment are associated with mental ill-health through epigenetic mechanisms, in particular those involving genes regulating the response to stress.Methods: The Kupol cohort at baseline consists of 3959 children attending the 7th grade of compulsory school (13-14 years old) in 8 regions of central Sweden in the school years 2013-2014 or 2014-2015. Three follow-up surveys in subsequent years are planned. Teachers' and students' perceptions of the culture, climate and ethos of their schools, and students' mental ill-health are assessed at the whole school level by annual questionnaire surveys. In order to conduct epigenetic analyses saliva specimens are collected from a nested sample of students at inception and two years later. Further, class-, family-and child-level information is collected at baseline and during each year of follow-up. Self-reported information is being complemented with register data via record-linkages to national and regional health and administrative registers.Discussion: The topic being investigated is new, and the sample constitutes the largest adolescent cohort in Sweden involved in an ad hoc study. Epigenetic analyses centered on environmental cues to stress response are a thoroughly new approach. Finally a notable feature is the multi-informant and multi-method data collection, with surveys at the school, class, family, and student level. Collaboration and data access: interested investigators should contact the coordinating centre. Additional information is available on the study's website, http://kupolstudien.se/.
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| 4. |
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| 5. |
- Hultin, Hanna, et al.
(författare)
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A generative model of a limit order book using recurrent neural networks
- 2023
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Ingår i: Quantitative finance (Print). - : Informa UK Limited. - 1469-7688 .- 1469-7696. ; 23:6, s. 931-958
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Tidskriftsartikel (refereegranskat)abstract
- In this work, a generative model based on recurrent neural networks for the complete dynamics of a limit order book is developed. The model captures the dynamics of the limit order book by decomposing the probability of each transition into a product of conditional probabilities of order type, price level, order size and time delay. Each such conditional probability is modelled by a recurrent neural network. Several evaluation metrics for generative models related to trading execution are introduced. Using these metrics, it is demonstrated that the generative model can be successfully trained to fit both synthetic and real data from the Nasdaq Stockholm exchange.
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| 6. |
- Hultin, Hanna
(författare)
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Generative models of limit order books
- 2021
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In this thesis generative models in machine learning are developed with the overall aim to improve methods for algorithmic trading on high-frequency electronic exchanges based on limit order books. The thesis consists of two papers.In the first paper a new generative model for the dynamic evolution of a limit order book, based on recurrent neural networks, is developed. The model captures the full dynamics of the limit order book by decomposing the probability of each transition of the limit order book into a product of conditional probabilities of order type, price level, order size, and time delay. Each such conditional probability is modeled by a recurrent neural network. In addition several evaluation metrics for generative models related to order execution are introduced. The generative model is successfully trained to fit both synthetic data generated by a Markov model and real data from the Nasdaq Stockholm exchange.The second paper explores reinforcement learning methods to find optimal policies for trading execution in Markovian models. A number of different approaches are implemented and compared, including a baseline time-weighted average price (TWAP) strategy, tabular Q-learning, and deep Q-learning based on predefined features as well as with the entire limit order book as input. The results indicate that it is preferable to use deep Q-learning with the entire limit order book as input to design efficient execution policies. In order to improve the understanding of the decisions taken by the agent, the learned action-value function for the deep Q-learning with predefined features is visualized as a function of selected features.
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| 7. |
- Hultin, Hanna, et al.
(författare)
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Lack of Adjustment Latitude at Work as a Trigger of Taking Sick Leave : A Swedish Case-Crossover Study
- 2013
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Ingår i: PLOS ONE. - : Public Library of Science. - 1932-6203. ; 8:4
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Tidskriftsartikel (refereegranskat)abstract
- ObjectivesResearch has shown that individuals reporting a low level of adjustment latitude, defined as having few possibilities to temporarily adjust work demands to illness, have a higher risk of sick leave. To what extent lack of adjustment latitude influences the individual when making the decision to take sick leave is unknown. We hypothesize that ill individuals are more likely to take sick leave on days when they experience a lack of adjustment latitude at work than on days with access to adjustment latitude.MethodsA case-crossover design was applied to 546 sick-leave spells, extracted from a cohort of 1 430 employees at six Swedish workplaces, with a 3–12 month follow-up of all new sick-leave spells. Exposure to lack of adjustment latitude on the first sick-leave day was compared with exposure during several types of control periods sampled from the previous two months for the same individual.ResultsOnly 35% of the respondents reported variations in access to adjustment latitude, and 19% reported a constant lack of adjustment latitude during the two weeks prior to the sick-leave spell. Among those that did report variation, the risk of sick leave was lower on days with lack of adjustment latitude, than on days with access (Odds Ratio 0.36, 95% Confidence Interval 0.25–0.52).ConclusionsThis is the first study to show the influence of adjustment latitude on the decision to take sick leave. Among those with variations in exposure, lack of adjustment latitude was a deterrent of sick leave, which is contrary to the à priori hypothesis. These results indicate that adjustment latitude may not only capture long-lasting effects of a flexible working environment, but also temporary possibilities to adjust work to being absent. Further studies are needed to disentangle the causal mechanisms of adjustment latitude on sick-leave.
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| 8. |
- Hultin, Hanna, et al.
(författare)
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Low level of adjustment latitude : a risk factor for sickness absence
- 2010
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Ingår i: European Journal of Public Health. - : Oxford University Press (OUP). - 1101-1262 .- 1464-360X. ; 20:6, s. 682-688
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Tidskriftsartikel (refereegranskat)abstract
- Background: The prerequisite for obtaining sickness benefit is reduced work ability for medical reasons in combination with work demands which cannot be adjusted accordingly. The aim of this study was to investigate if low levels of adjustment latitude, defined as the possibility to temporarily adjust work demands in case of ill health, influence sickness absence. Methods: A prospective cohort study of 1420 employees (47% participation, aged 19-68; 56% women) was conducted at six Swedish workplaces. Exposure to two general and nine specific types of adjustment latitude was ascertained at baseline. Outcome was defined as the first new employer-reported sick-leave spell during a follow-up of 3-12 months. Hazard ratios (HR) of sick leave, with 95% confidence intervals (CI), were estimated by Cox proportional hazards regression. Results: The incidence of sickness absence was 2.85/1000 person-days. The self-reported reasons for sick leave were mainly minor complaints such as colds, influenzas and headaches. Employees lacking adjustment latitude had an adjusted HR of sickness absence of 1.51 (95% CI 1.08-2.11). Among specific adjustment latitude types, those not having the possibility to work from home generated an HR of 1.86 (95% CI 1.31-2.64). The effects of lack of adjustment latitude were similar for men and women but seemed to vary between different occupations. Conclusion: A low level of adjustment latitude at work is a risk factor for sickness absence.
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| 9. |
- Hultin, Hanna, et al.
(författare)
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Low Workload as a Trigger of Sick Leave Results From a Swedish Case-Crossover Study
- 2012
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Ingår i: Journal of Occupational and Environmental Medicine. - : Lippincott, Williams and Wilkins. - 1076-2752 .- 1536-5948. ; 54:2, s. 202-209
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To investigate if exposure to an unusually low workload when ill can trigger taking sick leave. Methods: A case-crossover design was applied to 546 sick-leave spells obtained from a cohort of 1430 employees within six Swedish workplaces. New sick-leave spells were reported from the workplaces during 3 to 12 months follow-up. Exposure was assessed in structured participant interviews at sick leave. Case and control periods from the same individual were sampled according to the matched-pair and usual-frequency approaches. Results are presented as odds ratios with surrounding 95% confidence intervals. Results: The odds ratio of sick leave on a day with an unusually low workload was 2.57 (confidence interval, 1.07-6.16). Conclusions: Becoming ill on a day with a lower workload than usual can trigger the decision to take sick leave.
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| 10. |
- Hultin, Hanna, et al.
(författare)
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Pedagogical and Social School Climate : Psychometric Evaluation and Validation of the Student Edition of PESOC
- 2019
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Ingår i: Scandinavian Journal of Educational Research. - : Routledge. - 0031-3831 .- 1470-1170. ; 63:4, s. 534-550
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Tidskriftsartikel (refereegranskat)abstract
- Previous studies indicate that school climate is important for student health and academic achievement. This study concerns the validity and reliability of the student edition a Swedish instrument for measuring pedagogical and social school climate (PESOC). Data were collected from 5,745 students at 97 Swedish secondary schools. Multilevel confirmatory factor analyses were conducted, and multilevel composite reliability estimates, as well as correlations with school-level achievement indicators, were calculated. The results supported an 8-factor structure at the student level and 1 general factor at the school level. Factor loadings and composite reliability estimates were acceptable at both levels. The school-level factor was moderately and positively correlated with school-level academic achievement. The student PESOC is a promising instrument for studying school climate.
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| 11. |
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| 12. |
- Hultin, Hanna, et al.
(författare)
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Short-term sick leave and future risk of sickness absence and unemployment : the impact of health status
- 2012
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Ingår i: BMC Public Health. - : Springer Science and Business Media LLC. - 1471-2458. ; 12, s. 861-
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Tidskriftsartikel (refereegranskat)abstract
- Background: In previous studies the authors have found sick leave to be a predictor of future sick leave, unemployment and disability pension. Although sick leave reflects underlying health problems, some studies have suggested that sick leave may have consequences beyond the consequences of the underlying illness. However, few studies have aimed at studying consequences of sick leave while adjusting for ill health. This study aims to explore whether short-term sick leave increases the risk of future long-term sick leave, disability pension, and unemployment. Furthermore, we aim to control for the potentially confounding effects of physical and mental health status. Methods: Data were gathered from the Stockholm Public Health Cohort (SPHC), restricted to 11,156 employed individuals (48.6% men) aged 18-59, without long-term sick leave, disability pension or in-patient care the year before inclusion (2002). These were followed-up with regard to unemployment, long-term sick leave, and disability pension in 2006 and 2007. Odds ratios (OR) with corresponding 95% confidence intervals (CI) were estimated by logistic regression, controlling for six different measures of health status (limiting long-standing illness, self-rated health, mental health, somatic disease, musculoskeletal pain and in-patient care) and socio-demographic factors. Results: Results from the unadjusted analyses indicated increased risks of long-term sick leave (OR 2.00; CI 1.62-2.46) and short-term unemployment (OR 1.76; CI 1.35-2.29) for individuals exposed to more than one short-term sick-leave spell. There were no increased odds of long-term unemployment (OR 0.54; CI 0.28-1.04) or disability pension (OR 0.72; CI 0.42-1.24). After adjusting for the different measures of health status the odds ratio for short-term unemployment was not statistically significant (OR 1.29; CI 0.97-1.74). The odds ratios for the other outcomes slightly increased after adjustment for the used measures of health status. Conclusions: The results support the assumption that short-term sick leave may have consequences for future sick leave beyond the effect of ill health. The results point to the importance of paying attention to short-term sick leave in order to prevent subsequent sickness absence.
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| 13. |
- Hultin, Hanna, et al.
(författare)
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The Importance of Pedagogical and Social School Climate to Bullying : A Cross‐Sectional Multilevel Study of 94 Swedish Schools
- 2021
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Ingår i: Journal of School Health. - : Wiley. - 0022-4391 .- 1746-1561. ; 91:2, s. 111-124
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Bullying is a public health issue with long‐term effects for victims. This study investigated if there was an association between pedagogical and social school climate and student‐reported bullying victimization, which dimensions of pedagogical and social school climate were associated with bullying, and if these associations were modified by individual‐level social factors.METHODS: The study had a cross‐sectional multilevel design with individual‐level data on bullying from 3311 students nested in 94 schools over 3 consecutive school years. School climate was measured with student and teacher questionnaires, aggregated at the school level. The association between school climate and bullying victimization was estimated with multilevel mixed‐model logistic regression.RESULTS: In schools with the most favorable school climate, fewer students reported being bullied. This was especially evident when school climate was measured with the student instrument. Students in schools with favorable climate had an adjusted odds ratio of bullying of 0.74 (95% CI: 0.55‐1.00) compared to students in schools with the worst climate. Results from the teacher instrument were in the same direction, but less consistent.CONCLUSIONS: Improvement in school climate has the potential to affect students both academically, and socially, as well as decrease the prevalence of bullying.
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| 14. |
- Hultin, Hanna
(författare)
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Triggers of sick leave : epidemiological studies of work-related factors
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Background: In Sweden, the prerequisite for compensation during sick leave is a reduction of work ability due to disease or injury. Perhaps as a result of this, sick leave varies between individuals with the same diagnosis and over time in the population in a way that does not coincide with the variations in population health. This implies that to better understand the social phenomenon that is sick leave we need to look into other factors which may influence the association between disease, illness, sickness and sick leave. Aim: The main aim of this thesis was to identify and estimate the effect of factors at work which influence ill individuals to take sick leave. Methods: All four studies were based on data from the TUFS-project (an acronym in Swedish for “Triggers of sick leave”) which took place at six Swedish workplaces in health care, manufacturing industry, and white-collar office work between 2005 and 2007. A total of 1 430 employees (participation proportion 47%) answered a questionnaire at baseline and were subsequently followed with regard to sick leave for 3-12 months and interviewed during or shortly after taking sick leave. Study I used a cohort design assessing exposure at baseline with a longitudinal follow-up of sick leave, and Studies II-IV used a case-crossover design which included only individuals on sick leave, with each case serving as its’ own control. Exposure was measured in a telephone interview conducted during or shortly after sick leave. Results: In Study I an increased risk of future sick leave was found for individuals with a low level of adjustment latitude, whether measured as the general level of adjustment latitude or as having few different types of adjustment possibilities. This is in line with previous studies of adjustment latitude. However in Study II, the results indicated that many individuals had a stable pattern of exposure to lack of adjustment latitude. Among the 35% with variations in exposure during the two weeks prior to sick leave a decreased risk of sick leave was found on days when the participants were exposed to lack of adjustment latitude. In Study III an increased risk of sick leave was found when individuals had been exposed to problems in the relationship with colleagues or superiors the previous two workdays. Furthermore individuals were more likely to take sick leave when they expected a very stressful work situation during the following workday. In Study IV an increased risk of sick leave was found when the participants expected a lower workload than usual. Conclusion: A possible interpretation of the results from Studies I and II is that adjustment latitude both may capture long-lasting effects of a flexible work environment, and temporary possibilities to adjust work to being absent. The increased risks of sick leave found when having been exposed to problems in workplace relationships and when expecting a stressful work situation or a lower workload than usual (Studies III and IV) may function by lowering the threshold of reduced work ability at which an employee feel the need to take sick leave.
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| 15. |
- Hultin, Hanna, et al.
(författare)
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Work-related psychosocial events as triggers of sickleave – results from a Swedish case-crossover study
- 2011
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Ingår i: BMC Public Health. - : BMC. - 1471-2458. ; 11:175
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Tidskriftsartikel (refereegranskat)abstract
- Background Although illness is an important cause of sick leave, it has also been suggested that non-medical risk factors may influence this association. If such factors impact on the period of decision making, they should be considered as triggers. Yet, there is no empirical support available. The aim was to investigate whether recent exposure to work-related psychosocial events can trigger the decision to report sick when ill. Methods A case-crossover design was applied to 546 sick-leave spells, extracted from a Swedish cohort of 1 430 employees with a 3-12 month follow-up of new sick-leave spells. Exposure in a case period corresponding to an induction period of one or two days was compared with exposure during control periods sampled from workdays during a two-week period prior to sick leave for the same individual. This was done according to the matched-pair interval and the usual frequency approaches. Results are presented as odds ratios (OR) with 95% confidence intervals (CI). Results Most sick-leave spells happened in relation to acute, minor illnesses that substantially reduced work ability. The risk of taking sick leave was increased when individuals had recently been exposed to problems in their relationship with a superior (OR 3.63; CI 1.44-9.14) or colleagues (OR 4.68; CI 1.43-15.29). Individuals were also more inclined to report sick on days when they expected a very stressful work situation than on a day when they were not under such stress (OR 2.27; CI 1.40-3.70). Conclusions Exposure to problems in workplace relationships or a stressful work situation seems to be able to trigger reporting sick. Psychosocial work-environmental factors appear to have a short-term effect on individuals when deciding to report sick.
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| 16. |
- Johansson, Gun, 1957-, et al.
(författare)
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The impact of adjustment latitude on self-assessed work ability in regard to gender and occupational type
- 2012
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Ingår i: Scandinavian Journal of Occupational Therapy. - : Informa Healthcare. - 1103-8128 .- 1651-2014. ; 19:4, s. 350-359
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Tidskriftsartikel (refereegranskat)abstract
- Objective: Adjustment latitude describes opportunities to change demands at work when ill and may affect work ability. The aim here is to study the association between adjustment latitude and self-assessed work ability among men and women and employees from different occupational sectors.Methods: This cross-sectional study used data from a questionnaire sent to 3020 employees in three occupational sectors in Sweden; 1430 responded. Subjects were divided into: full, moderately reduced, and greatly reduced work ability. Presence of nine adjustment opportunities was requested and subjects were divided into three groups. Each specific opportunity was also analyzed in relation to work ability. Multinomial logistic regression was used for analyses.Results: Number of opportunities to adjust was associated with work ability among men and employees in health care. "Shortening the working day" was associated with work ability in most groups. For men and industrial employees, "postponing work", "going home and working later", and "working without disturbance" were associated with work ability. "To work from home" was associated with work ability among women and employees in insurance.Conclusions: The assumption that adjustment latitude affects work ability is supported. Associations differ with regard to gender and occupational sectors. Further studies with longitudinal design and alternative samples are needed.
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| 17. |
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| 18. |
- Morian, Hanna, et al.
(författare)
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Reliability and validity testing of team emergency assessment measure in a distributed team context
- 2023
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Ingår i: Frontiers in Psychology. - 1664-1078. ; 14
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Tidskriftsartikel (refereegranskat)abstract
- Medical multi-professional teams are increasingly collaborating via telemedicine. In distributed team settings, members are geographically separated and collaborate through technology. Developing improved training strategies for distributed teams and finding appropriate instruments to assess team performance is necessary. The Team Emergency Assessment Measure (TEAM), an instrument validated in traditional collocated acute-care settings, was tested for validity and reliability in this study when used for distributed teams. Three raters assessed video recordings of simulated team training scenarios (n = 18) among teams with varying levels of proficiency working with a remotely located physician via telemedicine. Inter-rater reliability, determined by intraclass correlation, was 0.74-0.92 on the TEAM instrument's three domains of leadership, teamwork, and task management. Internal consistency (Cronbach's alpha) ranged between 0.89-0.97 for the various domains. Predictive validity was established by comparing scores with proficiency levels. Finally, concurrent validity was established by high correlations, >0.92, between scores in the three TEAM domains and the teams' overall performance. Our results indicate that TEAM can be used in distributed acute-care team settings and consequently applied in future-directed learning and research on distributed healthcare teams.
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| 19. |
- Muhr, L. Sara Arroyo, et al.
(författare)
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Human papillomavirus type 197 is commonly present in skin tumors
- 2015
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Ingår i: International Journal of Cancer. - : Wiley. - 0020-7136 .- 1097-0215. ; 136:11, s. 2546-2555
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Tidskriftsartikel (refereegranskat)abstract
- Non-melanoma skin cancers commonly contain Human Papillomavirus (HPV), but the types found have varied depending on the polymerase chain reaction (PCR) primer systems used. Whole genome amplified DNA (not amplified by any specific PCR primers) from 91 skin lesions [41 squamous cell skin carcinomas (SCCs), 8 keratoacanthomas, 22 actinic keratoses, 3 basal cell carcinomas and 17 SCCs in situ] were sequenced. All samples were sequenced both at 160 Mb and 1.8 Gb sequencing depth per sample. The sequences from 10 different HPVs in 47/91 specimens were found. Sequences represented four established HPV types (HPV types 16, 22, 120, 124), two previously known putative types (present in GenBank) and four previously unknown HPV sequences (new putative types). The most commonly detected virus was cloned, sequenced and designated as HPV197. Type-specific real-time PCR detected HPV197 in 34/91 specimens. For comparison, a pool of the same samples after general primer PCR amplification was also sequenced. This revealed 40 different HPVs, but only two HPV types were detected both with sequencing without prior PCR and with sequencing PCR amplicons, suggesting that sequencing without prior PCR gives a more unbiased representation of the HPVs present. In summary, it was found that HPV can be sequenced from most skin disease specimens and HPV197 appeared to be the most commonly present virus. What's new? Some skin cancers such as squamous cell carcinomas occur more often in immune compromised individuals, pointing to an infectious agent as cause. In an unbiased approach the authors used next-generation sequencing to examine 91 non-melanoma skin cancer lesions. Most skin lesions contained Human Papilloma Virus (HPV). The authors cloned and sequenced a new type, HPV type 197, present in 34 of the 91 skin lesions. HPV197 has only 75% similarity with the most closely related known HPV (HPV178), suggesting a possible new agent involved in the carcinogenesis of non-melanoma skin lesions.
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| 20. |
- Poklukar, Petra, et al.
(författare)
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GraphDCA - a Framework for Node Distribution Comparison in Real and Synthetic Graphs
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- We argue that when comparing two graphs, the distribution of node structural features is more informative than global graph statistics which are often used in practice, especially to evaluate graph generative models. Thus, we present GraphDCA - a framework for evaluating similarity between graphs based on the alignment of their respective node representation sets. The sets are compared using a recently proposed method for comparing representation spaces, called Delaunay Component Analysis (DCA), which we extend to graph data. To evaluate our framework, we generate a benchmark dataset of graphs exhibiting different structural patterns and show, using three node structure feature extractors, that GraphDCA recognizes graphs with both similar and dissimilar local structure. We then apply our framework to evaluate three publicly available real-world graph datasets and demonstrate, using gradual edge perturbations, that GraphDCA satisfyingly captures gradually decreasing similarity, unlike global statistics. Finally, we use GraphDCA to evaluate two state-of-the-art graph generative models, NetGAN and CELL, and conclude that further improvements are needed for these models to adequately reproduce local structural features.
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