Documents disponibles écrits par cet auteur

Correlation when data are missing / M. Parzen in Journal of the operational research society (JORS), Vol. 61 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 61 N° 6 (Juin 2010) . - pp. 1049–1056 Titre : Correlation when data are missing Type de document : texte imprimé Auteurs : M. Parzen, Auteur ; S. Lipsitz, Auteur ; R. Metters, Auteur Année de publication : 2011 Article en page(s) : pp. 1049–1056 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Statistics  Methodology  Probability Index. décimale : 001.424 Résumé : Variable correlation is important for many operations research models. Many inventory, revenue management, and queuing models presume uncorrelated demand between products, market segments, or time periods. The specific model applied, or the resulting policies of a model, can differ drastically depending on variable correlation. Having missing data are a common problem for the real world application of operations research models. This work is at the junction of the two topics of correlation and missing data. We propose a test of independence between two variables when data are missing. The typical method for determining correlation with missing data ignores all data pairs in which one point is missing. The test presented here incorporates all data. The test can be applied when both variables are continuous, when both are discrete, or when one variable is discrete and the other is continuous. The test makes no assumptions about the distribution of the two variables, and thus it can be used to extend application of non-parametric rank tests, such as Spearman's rank correlation, to the case where data are missing. An example is shown where failure to incorporate the incomplete data yields incorrect policies. DEWEY : 001.424 ISSN : 0361-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v61/n6/abs/jors200949a.html [article] Correlation when data are missing [texte imprimé] / M. Parzen, Auteur ; S. Lipsitz, Auteur ; R. Metters, Auteur . - 2011 . - pp. 1049–1056. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 61 N° 6 (Juin 2010) . - pp. 1049–1056 Mots-clés : Statistics  Methodology  Probability Index. décimale : 001.424 Résumé : Variable correlation is important for many operations research models. Many inventory, revenue management, and queuing models presume uncorrelated demand between products, market segments, or time periods. The specific model applied, or the resulting policies of a model, can differ drastically depending on variable correlation. Having missing data are a common problem for the real world application of operations research models. This work is at the junction of the two topics of correlation and missing data. We propose a test of independence between two variables when data are missing. The typical method for determining correlation with missing data ignores all data pairs in which one point is missing. The test presented here incorporates all data. The test can be applied when both variables are continuous, when both are discrete, or when one variable is discrete and the other is continuous. The test makes no assumptions about the distribution of the two variables, and thus it can be used to extend application of non-parametric rank tests, such as Spearman's rank correlation, to the case where data are missing. An example is shown where failure to incorporate the incomplete data yields incorrect policies. DEWEY : 001.424 ISSN : 0361-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v61/n6/abs/jors200949a.html

“The way that can be told of is not an unvarying way” / R. Metters in Journal of operations management, Vol. 28 N° 3 (Mai 2010) 

Public ISBD [article]  in Journal of operations management > Vol. 28 N° 3 (Mai 2010) . - pp. 177–185 Titre : “The way that can be told of is not an unvarying way” : Cultural impacts on operations management in Asia Type de document : texte imprimé Auteurs : R. Metters, Auteur Année de publication : 2011 Article en page(s) : pp. 177–185 Note générale : Génie Industriel Langues : Anglais (eng) Mots-clés : Asia  National  culture  Operations  Management Résumé : This special issue is dedicated to Operations Management (OM) in Asia. A requirement for the special issue articles is that they have content related to the effects of national culture on OM. Here, the OM literature is combined with work from Anthropology and Women's Studies to provide a wide view of the effects of various Asian cultures on OM. The basic premise is that OM decisions may need to take culture into account: some OM practices are altered or precluded by culture, while others are more effective in some cultures than others. Numerous examples are provided involving quality management, shift scheduling, revenue management, facility location, layout, supply chain strategies, and other areas. DEWEY : 658.57 ISSN : 0272-6963 En ligne : http://www.sciencedirect.com/science/article/pii/S0272696309000783 [article] “The way that can be told of is not an unvarying way” : Cultural impacts on operations management in Asia [texte imprimé] / R. Metters, Auteur . - 2011 . - pp. 177–185. Génie Industriel Langues : Anglais (eng) in Journal of operations management > Vol. 28 N° 3 (Mai 2010) . - pp. 177–185 Mots-clés : Asia  National  culture  Operations  Management Résumé : This special issue is dedicated to Operations Management (OM) in Asia. A requirement for the special issue articles is that they have content related to the effects of national culture on OM. Here, the OM literature is combined with work from Anthropology and Women's Studies to provide a wide view of the effects of various Asian cultures on OM. The basic premise is that OM decisions may need to take culture into account: some OM practices are altered or precluded by culture, while others are more effective in some cultures than others. Numerous examples are provided involving quality management, shift scheduling, revenue management, facility location, layout, supply chain strategies, and other areas. DEWEY : 658.57 ISSN : 0272-6963 En ligne : http://www.sciencedirect.com/science/article/pii/S0272696309000783