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 525493
Title Een mathematisch-statistische studie over de nauwkeurigheid van het organoleptisch onderzoek van boter
Author(s) Posthumus, G.
Source University. Promotor(en): M.J. van Uven; B. van der Burg. - Zutphen : Thieme - 122
Publication type Dissertation, internally prepared
Publication year 1943
Keyword(s) boter - dierlijke producten - geur en smaak - aroma - smaak - statistiek - waarschijnlijkheidsanalyse - wiskunde - cum laude - butter - animal products - flavour - taste - statistics - probability analysis - mathematics
Categories Sensory Sciences
Abstract The quality of butter, produced by the dairies in the Netherlands, is regularly tested by experienced testers after storage for 2 weeks usually at 14_C. Odour, taste and texture are tested. Usually a score is given, running from 1 (bad) to 5 (excellent). An analysis was made of the accuracy of the evaluations.
Differences in and between testers in score, for tests on many or one sample were assessed by the standard deviation of the score of one, or the mean score of 2 or more judges (subjective accuracy). Deviations were normally distributed. Accuracy was expressed as the correlation coefficient (r) between the scores by one or more judges and the 'real' score (the mean score given by many judges): the objective accuracy.

An extensive mathematical treatment was given to show how r depends on the number of judges. Starting from the fact that for 2 judges r = 0.80, the value for 1 judge was found to be r = 0.686 and for 3 judges 0.853. At least 3 judges were necessary. Methods were given of expressing the capability of 1 judge in terms of r. The subjective and objective accuracy of judges can differ much.
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