Hello everyone!

Can someone explain me the difference between the "principal-factor" and "principal-component factor" options for factor analysis in stata 15? On my data, they lead to fundamentally different results. I know that this question has already been answered multiple times, but in my opinion not to a satisfactory extend. I have seen two posts about this, here and on research gate that refer to

Harman (1976). It is, however, not clear where Harman describes the "principal-component factor" method. Maybe in Chapter 8.2 "Component Analysis"?

Thank you for your reply.

Similar Discussion: https://www.stata.com/statalist/arch.../msg00321.html

Harman, Harry H. (1976): Modern Factor Analysis. Third Edition Revised. The University of Chicago Press.