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I have a 2 (valence: pos vs neg) x 4 (stimulus type) design. Both variables were assessed within each subject. Additionally, I have a metric trait variable. A simple way would be to do a median split an incorporate it as a between variable to a 2x2x4 ANOVA, but I am aware of problems with median splits (although sometimes exaggerated, see DeCoster, Iselin, & Gallucci, 2009).
I tried to run the it as an ANCOVA, including the trait variable as a metric variable, but I am not really satisfied with the interpretability of this option.
Do you have any other ideas how to analyze the data and keeping the trait variable as a metric one?
I use SPSS and MATLAB.