| 1. |
- Hacker, R Scott, 1964-, et al.
(författare)
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Optimal lag-length choice in stable and unstable VAR models under situations of homoscedasticity and ARCH
- 2008
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Ingår i: Journal of Applied Statistics. - : Routledge. - 0266-4763 .- 1360-0532. ; 35:6, s. 601-615
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Tidskriftsartikel (refereegranskat)abstract
- The performance of different information criteria - namely Akaike, corrected Akaike (AICC), Schwarz-Bayesian (SBC), and Hannan-Quinn - is investigated so as to choose the optimal lag length in stable and unstable vector autoregressive (VAR) models both when autoregressive conditional heteroscedasticity (ARCH) is present and when it is not. The investigation covers both large and small sample sizes. The Monte Carlo simulation results show that SBC has relatively better performance in lag-choice accuracy in many situations. It is also generally the least sensitive to ARCH regardless of stability or instability of the VAR model, especially in large sample sizes. These appealing properties of SBC make it the optimal criterion for choosing lag length in many situations, especially in the case of financial data, which are usually characterized by occasional periods of high volatility. SBC also has the best forecasting abilities in the majority of situations in which we vary sample size, stability, variance structure (ARCH or not), and forecast horizon (one period or five). frequently, AICC also has good lag-choosing and forecasting properties. However, when ARCH is present, the five-period forecast performance of all criteria in all situations worsens.
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| 2. |
- Olsson, Michael, et al.
(författare)
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Modelling International Trade : A study of the EU Common Market and Transport Economies
- 2008
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Ingår i: Mölle 2008, The Tenth Annual SNEE European Integration Conference. - : SNEE. ; , s. 11 sidor-
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Konferensbidrag (refereegranskat)abstract
- In this paper, Swedish export is investigated, and data for export value and the number of firms that export is analysed. The main purpose is to compare constrained gravity models to gravity models without constraints. It is shown that constrained gravity models represent the export data in a relatively better way. The EU common market and transport economies are introduced into versions of the constrained gravity model, and the results show that the model fits the data even better.
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| 3. |
- Hilletofth, Per
(författare)
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Differentiated Supply Chain Strategy - Building Knowledge through Case Studies
- 2008
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Ingår i: Fourth International Railway Logistics Seminar. - Kouvola, Finland : Lappeenranta University of Technology. - 9789522146014 ; , s. 5-28, s. 5-28, s. 5-28
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Nowadays companies usually offer a wide range of products and services in various types of non-coherent business environments. It is becoming apparent that traditional ‘one-size-fits-all’ supply chain strategies does not support a wide range of products sold in a diversity of markets. Consequently, it becomes increasingly necessary to employ different manufacturing and delivery strategies concurrently in order to develop a differentiated supply chain strategy. This paper employs a descriptive multiple case study approach to illustrate how two companies has develop a differentiated supply chain strategy. Case study findings reveal that one efficient method to develop a differentiated supply chain strategy is to combine different manufacturing and delivery strategies into various supply chain solutions. By combining relatively few strategies it is possible to develop several differentiated supply chain solutions.
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| 4. |
- Hilletofth, Per
(författare)
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Enterprise resource planning systems in higher education
- 2008
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Ingår i: Proceedings of the 4th Railway logistics Seminar. - Kouvola, Finland : Lappeenranta University of Technology. ; , s. 167-180, s. 167-180, s. 167-180
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Konferensbidrag (refereegranskat)abstract
- Information systems and technology are becoming more and more important in the industry. Consequently, it is important to include these in any modern logistics education. This paper describes how ERP-systems are utilized in logistics education programs and courses at University of Skövde (Sweden). The objective of this paper is to highlight the importance of information systems and technology in a modern logistics education.
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| 5. |
- Hilletofth, Per, et al.
(författare)
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Supply chain management in fashion and textile industry
- 2008
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Ingår i: International Journal of Services Sciences. - : Inderscience. - 1753-1446 .- 1753-1454. ; 1:2, s. 127-147
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Tidskriftsartikel (refereegranskat)abstract
- In fashion and textile business, the demand changes rapidly due to fashion trends and a volatile market situation. This demand is unpredictable and could vary and change completely in a short time, creating high difficulties for supply chain. To create a leagil (lean and agile) supply chain is one observed way for a fashion and textile retailing company to optimise its performance and to remain competitive. One good example from such is fashion retailer Zara, which has adopted leagile approach and combined this with key success factors for fashion retailing. However, in this paper, we argue that the leagile approach is not a universal solution in the fashion and textile business. For some fashion and textile companies, the lean approach is more adequate. Case study findings and simulation results reveal that the lean and leagile approach could coexist as different strategy alternatives – simulation results favour leagile strategy, while five year profitability analysis shows lean apparel retailer H&M to have higher profitability than Zara.
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| 6. |
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