Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 311605
Title Weighted analysis for missing values in generalized procrustes analysis
Author(s) Wilkinson, C.; Schipper, M.; Leguijt, T.
Source Food Quality and Preference 11 (2000)1/2. - ISSN 0950-3293 - p. 85 - 90.
Department(s) Agrotechnological Research Institute
Publication type Refereed Article in a scientific journal
Publication year 2000
Abstract Generalized Procrustes Analysis (GPA), a popular tool in sensory science, is generally carried out on panelist data matrices averaged over replicates. This paper addresses the problem of missing values arising when panelists miss sessions. Because this does not necessarily result in missing values in the final averaged data matrices, a weighted analysis is proposed with weights set proportional to the number of replicates for each panelist product combination. In a simulation study the weighted analysis gives a better match of the rotated panelist matrices (a lower loss) than the unweighted analysis although the resulting average configuration is not significantly closer to the true configuration. The weighted analysis is a straightforward extension to GPA for dealing with missing sessions and offers an improved basis on which to evaluate panelist performance.
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