Forkman, Johannes
(2011).
Linear mixed models for series of variety trials.
Biuletyn Oceny odmian. 33
, 63-72
[Journal article]
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Abstract
When using linear mixed models for analysis of series of variety trials, the statistical inference space is dependent on the design of the series. In this paper, four inference spaces are recognized for one-year crop variety trials: single-year local, long-term local, single-year regional and long-term regional. In addition, different linear mixed models are appropriate for different designs. Five models are defined that are useful for 13 different types of series of variety trials. The standard statistical analysis includes estimation of variance components using the REML method and estimation of variety means by generalised least squares. Although this standard method gives the best linear estimates, provided correct variance components, the estimated differences between the test varieties and the control variety occasionally do not agree with yearly or local results. An alternative method is outlined, termed the control method, which does not have this problem.
Authors/Creators: | Forkman, Johannes |
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Title: | Linear mixed models for series of variety trials |
Series/Journal: | Biuletyn Oceny odmian (0137-155X) |
Year of publishing : | 2011 |
Volume: | 33 |
Page range: | 63-72 |
Publisher: | COBORU |
ISSN: | 0137-155X |
Language: | English |
Additional Information: | Biuletyn Oceny Odmian = Cultivar testing bulletin |
Publication Type: | Journal article |
Refereed: | No |
Article category: | Other scientific |
Version: | Accepted version |
Full Text Status: | Public |
Subjects: | Obsolete subject words > SOCIAL SCIENCES > Statistics, computer and systems science > Statistics (A) Swedish standard research categories 2011 > 1 Natural sciences > 101 Mathematics > 10106 Probability Theory and Statistics |
Keywords: | Inference spaces, Linear mixed models, Series of variety trials, VCU testing |
URN:NBN: | urn:nbn:se:slu:epsilon-e-257 |
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-257 |
ID Code: | 8422 |
Department: | (NL, NJ) > Dept. of Crop Production Ecology |
Deposited By: | Johannes Forkman |
Deposited On: | 16 Nov 2011 15:34 |
Metadata Last Modified: | 02 Dec 2014 10:47 |
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