I ran a linear mixed model (LMM) for my nested data and would like to check for the homogeneity of variance assumption.
As there is no a button for checking the homogeneity of variance at the LMM menu, I am wondering can I used the residuals generated from the model and ran a levene test of variance?
However, the residuals generated got negative value and seemed that levene test of variance only allow positive value?
Can I transform the residuals in order to conduct a levene test of variance, or should I transform the dependent variable?
I am really confuse and thank you so much for all the help.