Library Catalogue

Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104609
Title Een mathematisch-statistische studie over de nauwkeurigheid van het organoleptisch onderzoek van boter
show extra info.
door G. Posthumus
Author(s) Posthumus, G.
Publisher Zutphen : Thieme
Publication year 1943
Description 122 p ill
Notes Proefschrift Wageningen
Tutors Uven, Prof. Dr. M.J. van ; Burg, Prof. Ir. B. van der
Graduation date 1943-07-14
Dissertation no. 125
Author abstract show 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.

Online full textINTERNET
On paper FORUM ; STACKS ; 280G24
FORUM ; STACKS ; NN08202,125
Keyword(s) (cab) butter / animal products / flavour / aroma / taste / statistics / probability analysis / mathematics
Categories Sensory Sciences
Publication type PhD thesis
Language Dutch; Flemish
About cum laude graduation (with distinction)
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