Cannot perform factorial ANOVA

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by IlzeD » Wed Jun 09, 2021 8:43 am

Hi!
I 3 factors in my dataset. I am able to run one-way ANOVA using any single factor separately. When I try to perform factorial ANOVA, it works only for one of the factors, for two remaining I get zero values for SS and NaN for df (which means I do not get any F and p value). Can you suggest what might be wrong with my data?
IlzeD
 
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by jonathon » Wed Jun 09, 2021 9:23 am

this is probably a problem with 'aliased coefficients':

https://stats.stackexchange.com/questions/112442/what-are-aliased-coefficients

cheers

jonathon
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jonathon
 
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by IlzeD » Wed Jun 09, 2021 2:00 pm

Many thanks.
IlzeD
 
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