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Number of consumers necessary for shelf life estimations based on survival analysis statistics

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dc.contributor Universitat de Vic. Escola Politècnica Superior
dc.contributor Universitat de Vic. Grup de Recerca en Bioinformàtica i Estadística Mèdica
dc.contributor.author Hough, Guillermo
dc.contributor.author Calle, M. Luz
dc.contributor.author Serrat Jurado, Carles
dc.contributor.author Curia, Ana
dc.date.accessioned 2014-02-21T10:50:39Z
dc.date.available 2014-02-21T10:50:39Z
dc.date.created 2007
dc.date.issued 2007
dc.identifier.citation Hough, G., Calle Rosingana, M. L., Serrat Jurado, C., & Curia, A. (2007). Number of consumers necessary for shelf life estimations based on survival analysis statistics. Food Quality and Preference, 18(5), 771-775. ca_ES
dc.identifier.issn 0950-3293
dc.identifier.uri http://hdl.handle.net/10854/2729
dc.description.abstract Survival analysis statistics have been used to estimate shelf life of foods based on consumers’ acceptance or rejection of samples with different storage times. The interval censored nature of the data does not allow regular methods to estimate the number of necessary consumers (N) for these studies. The objective of the present work was to use simulation studies to estimate N considering the error in the estimation, statistical significance and statistical power. Based on previous studies a Weibull model was assumed for the lifetime distribution with a shape parameter r between 0.17 and 0.71. Simulations were calculated supposing shelf-life values in the middle range of an adimensional time scale. Graphs to estimate N under different scenarios are presented. Considering the average r, an alpha value (Type I error) of 5%, a beta value (Type II error) of 20%, the shelf life to be in the middle of the studied time range, and a difference between the true shelf life and the estimated shelf life of 0.5 on a 0–6 time scale, gave an N value of 120 consumers for this particular set of parameters. ca_ES
dc.format application/pdf
dc.format.extent 5 p. ca_ES
dc.language.iso eng ca_ES
dc.publisher Elsevier ca_ES
dc.rights (c) 2007 Elsevier. Published article is available at: http://dx.doi.org/doi:10.1016/j.foodqual.2007.01.003
dc.subject.other Anàlisi de supervivència (Estadística) ca_ES
dc.title Number of consumers necessary for shelf life estimations based on survival analysis statistics ca_ES
dc.type info:eu-repo/semantics/article ca_ES
dc.identifier.doi https://doi.org/doi:10.1016/j.foodqual.2007.01.003
dc.relation.publisherversion http://www.sciencedirect.com/science/article/pii/S0950329307000146
dc.rights.accesRights info:eu-repo/semantics/closedAccess ca_ES
dc.type.version info:eu-repo/publishedVersion ca_ES
dc.indexacio Indexat a SCOPUS
dc.indexacio Indexat a WOS/JCR ca_ES

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