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Empirical analysis of ambulance travel times / Susan Budge in Management science, Vol. 56 N° 4 (Avril 2010) 

Public ISBD [article]  in Management science > Vol. 56 N° 4 (Avril 2010) . - pp. 716-723 Titre : Empirical analysis of ambulance travel times : The case of calgary emergency medical services Type de document : texte imprimé Auteurs : Susan Budge, Auteur ; Armann Ingolfsson, Auteur ; Dawit Zerom, Auteur Année de publication : 2010 Article en page(s) : pp. 716-723 Note générale : Management Langues : Anglais (eng) Mots-clés : Ambulance  service  Probability-of-coverage  map  Nonparametric  Travel Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Using administrative data for high-priority calls in Calgary, Alberta, we estimate how ambulance travel times depend on distance. We find that a logarithmic transformation produces symmetric travel-time distributions with heavier tails than those of a normal distribution. Guided by nonparametric estimates of the median and coefficient of variation, we demonstrate that a previously proposed model for mean fire engine travel times is a valid and useful description of median ambulance travel times. We propose a new specification for the coefficient of variation, which decreases with distance. We illustrate how the resulting travel-time distribution model can be used to create probability-of-coverage maps for diagnosis and improvement of system performance. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/4.toc [article] Empirical analysis of ambulance travel times : The case of calgary emergency medical services [texte imprimé] / Susan Budge, Auteur ; Armann Ingolfsson, Auteur ; Dawit Zerom, Auteur . - 2010 . - pp. 716-723. Management Langues : Anglais (eng) in Management science > Vol. 56 N° 4 (Avril 2010) . - pp. 716-723 Mots-clés : Ambulance  service  Probability-of-coverage  map  Nonparametric  Travel Index. décimale : 658 Organisation des entreprises. Techniques du commerce Résumé : Using administrative data for high-priority calls in Calgary, Alberta, we estimate how ambulance travel times depend on distance. We find that a logarithmic transformation produces symmetric travel-time distributions with heavier tails than those of a normal distribution. Guided by nonparametric estimates of the median and coefficient of variation, we demonstrate that a previously proposed model for mean fire engine travel times is a valid and useful description of median ambulance travel times. We propose a new specification for the coefficient of variation, which decreases with distance. We illustrate how the resulting travel-time distribution model can be used to create probability-of-coverage maps for diagnosis and improvement of system performance. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/56/4.toc