Dear Donald,
thank you very much for your quick and clear reply!
When I use the full factorial module to set up an 2x2 ANOVA, assuming unequal variance for both factors , only one of the cells (Factor 1 level 2 - Factor 2 level 1) turns grey. If I have chosen "no centering" of covariate values, these columns turn grey across from that cell (this is not visible when selecting "overall mean" centering since the whole columns turn grey). Pleas see the enclosed figure. Do you have any explanation to why one cell is treated differently from the others?
The results also differ slightly between the different centering approaches.
Best regards,
Carl Johan Ekman
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