I am running a
summary(aov(...)) in R and I got this message:
Estimated effects may be unbalanced
What does it mean? How may I solve this problem?
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Install package called car & activate it first and then calculate sum of squares using
Doing this way will calculate type II SS which can be used for analysis when the interaction is not significant
and if the interaction is significant for the unbalanced data, you should calculate type III SS