Estimation Methods for EFA in JASP

Comments

• evankesteren

  November 2020

  From the documentation at your link:

  fm="ols" differs very slightly from "minres" in that it minimizes the entire residual matrix using an OLS procedure but uses the empirical first derivative. This will be slower.

  and a bit later:

  Following extensive correspondence with Hao Wu and Mikko Ronkko, in April, 2017 the derivative of the minres and uls) fitting was modified. This leads to slightly smaller residuals (appropriately enough for a method claiming to minimize them) than the prior procedure. For consistency with prior analyses, "old.min" was added to give these slightly larger residuals. The differences between old.min and the newer "minres" and "ols" solutions are at the third to fourth decimal, but none the less, are worth noting. For comparison purposes, the fm="ols" uses empirical first derivatives, while uls and minres use equation based first derivatives. The results seem to be identical, but the minres and uls solutions require fewer iterations for larger problems and are faster. Thanks to Hao Wu for some very thoughtful help.

  In short, it will be extremely similar. We provide this option only because psych provides it.

  As to your last question, I don't have a good answer ready. There might be some simulation studies out there comparing the different estimation methods for non-normal data.

  Hope this helps!

  Erik-Jan
• jpe

  November 2020

  Thank you, this is helpful!