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Publisert 2002

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Publikasjonsdetaljer

Tidsskrift : Statistics and computing , vol. 13 , p. 163–167 , 2002

Internasjonale standardnummer :
Trykt : 0960-3174
Elektronisk : 1573-1375

Publikasjonstype : Vitenskapelig artikkel

Bidragsytere : Langsrud, Øyvind

Sak : 2

Har du spørsmål om noe vedrørende publikasjonen, kan du kontakte Nofimas bibliotekleder.

Kjetil Aune
Bibliotekleder
kjetil.aune@nofima.no

Sammendrag

Methods for analyzing unbalanced factorial designs can be traced back to Yates (1934). Today, most major statistical programs perform, by default, unbalanced ANOVA based on Type III sums of squares (Yates's weighted squares of means). As criticized by Nelder and Lane (1995), this analysis is founded on unrealistic models-models with interactions, but without all corresponding main effects. The Type II analysis (Yates's method of fitting constants) is usually not preferred because of the underlying assumption of no interactions. This argument is, however, also founded on unrealistic models. Furthermore, by considering the power of the two methods, it is clear that Type II is preferable.