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Mplus Discussion > Confirmatory Factor Analysis >
 Liz Woodruff posted on Saturday, April 02, 2011 - 1:33 pm
In my measurement model, I have several latent variables for which there are only 2 indicators. When running the CFA, do I need to constrain these indicators somehow? Someone mentioned something to me about the indicators being "equal"? I don't know what this means, nor do I know how to do it.

 Bengt O. Muthen posted on Saturday, April 02, 2011 - 2:06 pm
No constraints needed as long as the factor which has those 2 indicators is correlated with other factors.

Indicators being equal might refer to holding loadings equal, that is fixed at one for both - but not needed here.
 Liz Woodruff posted on Saturday, April 02, 2011 - 2:26 pm
OK, when running the CFA, do I run all of the factor loadings simultaneously? E.g.,
MODEL: F1 BY y1, y4, y10;
F2 BY y2, y3, y5;
F3 BY y6, y7;
F4 BY y8, f9;

Or do I run each Latent variable separately?
e.g., F1 THEN F2 THEN F3 THEN F4
 Linda K. Muthen posted on Saturday, April 02, 2011 - 4:42 pm
If your model has more than one factor, you would run all of the factors simultaneously. You may want to listen to the Topic 1 and 2 course videos that are on the website.
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