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 104178
Title Het samenvatten van rassenproeven en het toepassen van vruchtbaarheidscorrecties met niet-orthogonale methoden
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door G. Hamming
Author(s) Hamming, G.
Publisher 's-Gravenhage : Staatsdrukkerij
Publication year 1949
Description 199 p.
Notes Proefschrift Wageningen  show all notes
Ook verschenen als: Verslagen van landbouwkundige onderzoekingen ; no. 54,19
Ook verschenen als handelsuitgave
Tutors Uven, Prof. Dr. M.J. van ; Dewez, Prof. Ir. W.J.
Graduation date 1949-06-15
Dissertation no. 149
Author abstract show abstract
Although a formula should be adequate, inadequate formulae had often to be used through lack of knowledge. With adequate formulae weighting of data was dependent on error expectation. With inadequate formulae weighting should be focused on representativeness. Some other pitfalls were discussed.

Correlation analysis was contrasted with regression analysis. These two models had in common that items of a universe were stochastically dependent on a functional relationship. Essential for correlation was that both correlated variables obeyed a probability distribution; for regression analysis this did not need to be true. In correlation the principal axis was a sound base for understanding relationships, while the regression line was a sound base for predictions. The contrast between understanding and prediction was discussed at large.

Special problems of pooling experiments were discussed. In principle a transformation of yield data was advisable if the interaction variety x experiment could be thus reduced. Yet the transformed yields remained inadequate. So weighting, if used, had to improve representativeness. A missing-plot technique for pooling was given.

A separate part deals with the reduction of residual error by drawing freehand fertility maps. This may be much more effective than the corrections provided by the design. A criterion was developed for avoiding undue detail in free-hand curves.


Online full textINTERNET
On paper FORUM ; STACKS ; 291B38
FORUM ; STACKS ; NN08202,149
Keyword(s) (cab) varieties / cultivars / races / statistics / probability analysis / mathematics / agriculture
Categories Plant Breeding and Genetics (General)
Publication type PhD thesis
Language Dutch; Flemish
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