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Sökning: WFRF:(Ostberg Per)

  • Resultat 1-3 av 3
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1.
  • Aronsson, Fredrik, et al. (författare)
  • Is cognitive impairment associated with reduced syntactic complexity in writing? Evidence from automated text analysis
  • 2021
  • Ingår i: Aphasiology. - : ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD. - 0268-7038 .- 1464-5041. ; 35:7, s. 900-913
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Written language impairments are common in Alzheimers disease and reduced syntactic complexity in written discourse has been observed decades before the onset of dementia. The validity of average dependency distance (ADD), a measure of syntactic complexity, in cognitive decline needs to be studied further to evaluate its clinical relevance. Aims: The aim of the study was to determine whether ADD is associated with levels of cognitive impairment in memory clinic patients. Methods & procedures: We analyzed written texts collected in clinical practice from 114 participants with subjective cognitive impairment, mild cognitive impairment, and Alzheimers disease during routine assessment at a memory clinic. ADD was measured using automated analysis methods consisting of a syntactic parser and a part-of-speech tagger. Outcomes & results: Our results show a significant association between ADD and levels of cognitive impairment, using ordinal logistic regression models. Conclusion: These results suggest that ADD is clinically relevant with regard to levels of cognitive impairment and indicate a diagnostic potential for ADD in cognitive assessment.
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2.
  • Linne, Markus, et al. (författare)
  • Development of calibration technique for underwater transducers in free field conditions below 1000 Hz with results on an acoustical recorder
  • 2022
  • Ingår i: Journal of the Acoustical Society of America. - : Acoustical Society of America (ASA). - 0001-4966 .- 1520-8524. ; 152:6, s. 3606-3615
  • Tidskriftsartikel (refereegranskat)abstract
    • A calibration technique with potential for low frequencies and sizeable systems of underwater transducers is being developed at the Swedish Defence Research Agency. The technique is based on the three-transducer spherical wave reciprocity method for use in an ice-covered lake with a depth of 220 m in the Swedish arctic zone. The calibration is performed at a depth of approximately 100 m with inter-transducer separations of 50 m, 86.6 m, and 100 m, allowing for frequencies down to 59 Hz using time-gated tone burst signals. In this paper, the calibration location, system, and technique are introduced, and the calibration results of an acoustical recorder in the range of 59 Hz-1 kHz are presented. The sensitivity is varying with frequency around -148 dB re 1 V/mu Pa, and the uncertainty budget is discussed.
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3.
  • Menkveld, Albert J., et al. (författare)
  • Nonstandard Errors
  • 2024
  • Ingår i: JOURNAL OF FINANCE. - : Wiley-Blackwell. - 0022-1082 .- 1540-6261. ; 79:3, s. 2339-2390
  • Tidskriftsartikel (refereegranskat)abstract
    • In statistics, samples are drawn from a population in a data-generating process (DGP). Standard errors measure the uncertainty in estimates of population parameters. In science, evidence is generated to test hypotheses in an evidence-generating process (EGP). We claim that EGP variation across researchers adds uncertainty-nonstandard errors (NSEs). We study NSEs by letting 164 teams test the same hypotheses on the same data. NSEs turn out to be sizable, but smaller for more reproducible or higher rated research. Adding peer-review stages reduces NSEs. We further find that this type of uncertainty is underestimated by participants.
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  • Resultat 1-3 av 3

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