Is it possible to output an ID variable with the outputted factor scores? Then I can make absolutely sure that the Nth factor score also belongs to the Nth case in my original data.
This is especially important a hierarchical dataset. If I'm not mistaken, the saved factor scores are scrambled - case nr 1 in this new file is NOT the same as case nr1 in my original data file. I *think* Mplus reorders the dataset so that the largest level-2 units come first? But I'm not 100% sure, so I'm hesitant to use the factor scores now.
FYI: The dataset I was trying out with, the example dataset ex9.6.dat, has no level-1/unique-case identifier, so therefore I didn't get it to work.
From what I see now, the IDVARIABLE option of the VARIABLE command isn't even necessary. After making afjusted the .dat file with a case nr identifier called "respnr", I think it doesn't matter if include that IDVARIABLE option or not; both methods also output the "clus" and the "respnr" variable in the factor scores output file.