factor analysis on dichotomous data

Posted by Kaat on Jul 06, 2010; 5:04pm
URL: http://spssx-discussion.165.s1.nabble.com/factor-analysis-on-dichotomous-data-tp1081162.html

Hi

I am struggling with a PCA on dichotmous data (1-0).
My data stem from a content analysis of 726 paragraphs. For each paragrpah the presence for each of 18 codes was indicated. I am looking for racial idoelogies and am only interested in the relationship between the codes.
I performed a PCA on the paragrpahs-codes matrix (with varimax) and got a nicely interpretable solution.
Now, I am unsure if I can report on this PCA results because my data are categorical. I tried to do CATPAC and but I don't know if you can rotate the components in a way similar to VARIMAX and if you can save component scores.

thanks!
Kaat