Dear folks,

does anyone know whether it is allowed to calculate a repeated measures ANOVA where one factor has no variability?

E.g. I have 3 types of errors (factor categories: A,B,C) and 6 action conditions (A,B,C,D,E,F). For each error I calculated the percentage of error within a condition (e.g. error type A / action A *100).

If i now conduct an ANOVA with the factor category and action condition on the percentage, I do not get any output values for the main effect action.

This is due to the fact that the percentage of all error categories within an action condition sums up to 100.

My question: Is it statistically allowed to calculate the ANOVA that way?

I am not interested in the main effect, but in the interactions.

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