I get the following message when doing categorical EFA with the ULS estimator:
THE INPUT SAMPLE CORRELATION MATRIX IS NOT POSITIVE DEFINITE. THE ESTIMATES GIVEN BELOW ARE STILL VALID.
However, the solution does not have a strong resemblence to what I get with WLSMV. The eigenvalue range looks about the same, but the PROMAX correlation matrix is very different. Also a number of items jump factors or switch signs.
The WLSMV yeilds a factor structure that compares favorably to prior EFA work with this instrument. How should I think about these ULS vs WLSMV solution differences?