Exact testing for heteroscedasticity in a two‐way layout in variety frost trials when incorporating a covariate

Summary Two‐way layouts are common in grain industry research where it is often the case that there are one or more covariates. It is widely recognised that when estimating fixed effect parameters, one should also examine for possible extra error variance structure. An exact test for heteroscedastic...

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Veröffentlicht in:	Australian & New Zealand journal of statistics 2023-12, Vol.65 (4), p.309-326
Hauptverfasser:	Pilkington, Angelika A., Clarke, Brenton R., Diepeveen, Dean A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Algorithms analysis of variance Design of experiments index set Layouts Likelihood ratio likelihood ratio test recursive residuals residual contrasts restricted maximum likelihood Zadoks scores
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