Perhaps I am missing something in the output, but I am trying to obtain the mean interitem correlation for a 12-item scale of categorical variables. Could you please help me with syntax? Also, at which version (e.g., Mplus 5.0) did this begin to be an option?
Perhaps others refer to it as the "Average Interitem correlation?" Essentially, I have composite scales that I have created, so I need to make sure there is some degree of unidimensionality and a moderate level of agreement between the items (i.e., coefficient ranging from .20-.50 per Clark & Watson, 1995).
Since these items are categorical, I believe they deserve tetrachoric correlations if I am not mistaken (as opposed to Spearman's, e.g.).