Acceptance sampling for food quality assurance : this dissertation is submitted for the degree of Doctor of Philosophy in Statistics, Institute of Fundamental Sciences, Massey University

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dc.contributor.authorSantos-Fernández, Edgar
dc.date.accessioned2017-07-27T02:00:27Z
dc.date.available2017-07-27T02:00:27Z
dc.date.issued2017
dc.description.abstractAcceptance sampling plays a crucial role in food quality assurance. However, safety inspection represents a substantial economic burden due to the testing costs and the number of quality characteristics involved. This thesis presents six pieces of work on the design of attribute and variables sampling inspection plans for food safety and quality. Several sampling plans are introduced with the aims of providing a better protection for the consumers and reducing the sample sizes. The effect of factors such as the spatial distribution of microorganisms and the analytical unit amount is discussed. The quality in accepted batches has also been studied, which is relevant for assessing the impact of the product in the public health system. Optimum design of sampling plans for bulk materials is considered and different scenarios in terms of mixing efficiency are evaluated. Single and two-stage sampling plans based on compressed limits are introduced. Other issues such as the effect of imperfect testing and the robustness of the plan have been also discussed. The use of the techniques is illustrated with practical examples. We considered numerous probability models for fitting aerobic plate counts and presence-absence data from milk powder samples. The suggested techniques have been found to provide a substantial sampling economy, reducing the sample size by a factor between 20 and 80% (when compared to plans recommended by the International Commission on Microbiological Specification for Food (ICMSF) and the CODEX Alimentarius). Free software and apps have been published, allowing practitioners to design more stringent sampling plans. Keywords: Bulk material, Composite samples, Compressed limit, Consumer Protection, Double sampling plan, Food safety, Measurement errors, Microbiological testing, Sampling inspection plan.en_US
dc.identifier.urihttp://hdl.handle.net/10179/11527
dc.language.isoenen_US
dc.publisherMassey Universityen_US
dc.rightsThe Authoren_US
dc.subjectFooden_US
dc.subjectQualityen_US
dc.subjectAnalysisen_US
dc.subjectSamplingen_US
dc.subjectSampling (Statistics)en_US
dc.subjectResearch Subject Categories::MATHEMATICS::Applied mathematics::Mathematical statisticsen_US
dc.subjectBulk materialen_US
dc.subjectComposite samplesen_US
dc.subjectCompressed limiten_US
dc.subjectConsumer protectionen_US
dc.subjectDouble sampling planen_US
dc.subjectFood safetyen_US
dc.subjectMeasurement errorsen_US
dc.subjectMicrobiological testingen_US
dc.subjectSampling inspection planen_US
dc.titleAcceptance sampling for food quality assurance : this dissertation is submitted for the degree of Doctor of Philosophy in Statistics, Institute of Fundamental Sciences, Massey Universityen_US
dc.typeThesisen_US
massey.contributor.authorSantos Fernandez, Edgar
thesis.degree.disciplineStatisticsen_US
thesis.degree.grantorMassey Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophy (PhD)en_US
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