Anne Buu posted on Wednesday, March 26, 2008 - 9:28 am
Q1: Are the factor scores saved by FSCORES calculated by expected a posteriori or maximum a posteriori? Q2: Are the factor scores calculated by assuming the parameters of fixed effects are known (i.e. filling in the estimates of parameters)? Q3: Why EFA does not produce factor scores? Is it "technically" not feasible or just "logically" not favored by the Mplus team?
1. This varies. For TYPE=GENERAL, categorical dependent variables, and weighted least squares estimation, it is maximum a posteriori. In other cases and for TYPE=GENERAL, categorical outcomes, and maximum likelihood estimation, it is expected a posteriori. 2. Yes. 3. It is basically that if someone asks for factor solutions for one through eight factors, it would end up being a massive file depending on the number of observations. In Version 5.1, there will be a new feature that will allow this in a more limited way.
We estimated factor scores from a cfa model and found that the correlations between the obtained factor scores and the manifest scale means (i.e. average scores over the items belonging to each factor) are close to 0 or even negative. We observed this in two independent data sets and respective cfa models.