Dear all,
On a group level, I am running a full factorial design which has two factors with two and three levels respectively (operationalized as 1,1, 1,2, 2,1, 2,2, 3,1 and 3,2). Each cell contains the previously defined contrasts for each. The analysis works fine until I run it adding age as a covariate (I had two groups of 27 and 23 participants). At that point I get:
Error using spm_meanby (line 31)
row dimension mismatch between inputs
I have already checked the number of cells corresponds and are correct, but I am wondering if perhaps the unbalanced groups cause the error and how I can solve it? I searched here and saw that many others had the same problem, but I could not find any suitable solutions for the error.
Kind regards,
Luciana
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