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 561314
Title Principal component analysis of TI-curves : Three methods compared
Author(s) Dijksterhuis, Garmt; Flipsen, Margo; Punter, Pieter
Source Food Quality and Preference 5 (1994)1-2. - ISSN 0950-3293 - p. 121 - 127.
DOI https://doi.org/10.1016/0950-3293(94)90017-5
Publication type Refereed Article in a scientific journal
Publication year 1994
Keyword(s) Principal Component Analysis - Principal TI-Curves - Time-Intensity
Abstract

Perception of time-related aspects of food and beverages is studied by using Time-Intensity (TI) methodology. Time-Intensity-data analysis often consists in summarising the curves of individual subjects by averaging them. For each averaged curve, a number of parameters (e.g. the time of onset, the rate of extinction, the maximum intensity, the time to maximum intensity, etc.) can be computed. In the study reported here, the Time-Intensity curves are analysed by means of a Principal Component Analysis (PCA). The resulting Principal Curves can be interpreted and reflect underlying similarities or differences between the time courses of the tastes involved. The loadings from the PCA's can be used to help in interpreting the Principal Curves and to identify clusters of assessors, or outliers. Non-centred PCA retains both level and variability information from the TI-curves and may be the preferred method for this reason. The centred PCA variants seem to give the tightest clustering of Principal Curves.

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