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What happens when the level 2 residual variances are requested for a 1-1-1 MSEM path model? I have noticed that this adds parameters to my model but am unsure otherwise. |
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You typically would want to include them in the model, although they are often close to zero. |
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The problem I have when requesting residuals for x-vars is that it appears my x-vars then get treated as y-vars. |
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Residual variances refer to dependent variables, including factor indicators, so they don't appear for x variables. So the premise for your question is unclear. |
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I had been working from some 1-1-1 MSEM syntax that requested residuals for x,m,&y variables. It didn't make sense to request an x variable, because it has no residual variance. That must be why Mplus is changing them to y variables. It looks like I should be able to leave that part of the syntax out. It also appears that Mplus estimates residuals for the m & y variables by default anyway, so they should be able to be left out. |
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