| Statistical models for analyzing repeated quality measurements of horticultural products. Model evaluations and practical example. | |
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MedLine Citation:
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PMID: 12941535 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In the field of postharvest quality assessment of horticultural products, research on the development of non-destructive quality sensors, replacing destructive and often time consuming sensors, has spurred in the last decennium offering the possibility of taking repeated quality measures on the same product. Repeated measures analysis is gaining importance during recent years and several software packages offer a broad class of routines. A dataset dealing with the postharvest quality evolution of different tomato cultivars serves as practical example for the comparison and discussion of four different statistical model types. Starting from an analysis at each time point and an ordinary least squares regression model as standard and widely used methods, this contribution aims at comparing these two methods to a repeated measures analysis and a longitudinal mixed model. It is shown that the flexibility of such a mixed model, both towards the repeated measures design of the experiments as towards the large product variability inherent to these horticultural products, is an important advantage over classical techniques. This research shows that different conclusions could be drawn depending on which technique is used due to the basic assumptions of each model and which are not always fulfilled. The results further demonstrate the flexibility of the mixed model concept. Using a mixed model for repeated measures, the different sources of variability, being inter-tomato variability, intra-tomato variability and measurement error were characterized being of great benefit to the researcher. |
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Authors:
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Bart De Ketelaere; Jeroen Lammertyn; Geert Molenberghs; Bart Nicolaï; Josse De Baerdemaeker |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Mathematical biosciences Volume: 185 ISSN: 0025-5564 ISO Abbreviation: Math Biosci Publication Date: 2003 Oct |
Date Detail:
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Created Date: 2003-08-27 Completed Date: 2003-10-09 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0103146 Medline TA: Math Biosci Country: United States |
Other Details:
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Languages: eng Pagination: 169-89 Citation Subset: IM |
Affiliation:
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K.U. Leuven, Department of Agro-Engineering and Economics, Laboratory for Agricultural Machinery and Processing, Kasteelpark Arenberg 30, 3001 Leuven, Belgium. bart.deketelaere@agr.kuleuven.ac.be |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Computer Simulation Crops, Agricultural / standards* Data Interpretation, Statistical* Lycopersicon esculentum / standards Models, Statistical* Quality Control |
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