# Variables in factor analysis with different metrics/response categories

If my data has different response categories (i.e. a 3-category vs. 4-category ordinal data), can I use standard factor analysis procedures? Do I need to transform my data in any way before starting analysis?

Thank you!

• as an addendum, the grm function in package ltm is the best one for a mix of variables with different levels – richiemorrisroe Feb 7 '12 at 10:33