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I find that Mplus adds correlations unspecified by my model. In the User's Guide it reads that correlations between exogenous variables are included automatically. Although I do not fully understand the rationale behind this and I wouldn't mind adding these correlations myself, I understand what is going on. I find, however, that also correlations between exogenous and (latent) endogenous variables are added. I wonder why this is and what I can do to prevent this, other than setting the loadings @0. |
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Defaults are chosen to fit what is most often seen in practice. If a parameter is free by default and you don't want it to be free, you can fix it at zero. |
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In this part of the input I have fixed all correlations to 0 that aren't between variables/factors in a 'column'. I realize that variables/factors that aren't in the same column can be related, but I prefer thinking of these as causal relationships, indicated by 'on' statements that I plan to add if indicated by the Modification Indices. x1-x5 with f1-f9@0; f1-f4 with f5-f9@0; f5-f7 with f8-f9@0; f8 with f9@0; Does this make sense? Will the input above lead to difficulty in estimating beta-weights? |
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Please show your full MODEL command. |
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model: f1 by y1 y2; f2 by y3 y4; f3 by y5 y6; f4 by y7 y8; f5 by y9 y10; f6 by y11 y12; f7 by y13 y14; f8 by y15 y16; f9 by y17 y18; f1 on x1 x2 x3 x4 x5; f2 on x1 x2 x3 x4 x5; f3 on x1 x2 x3 x4 x5; f4 on x1 x2 x3 x4 x5; f5 on f1 f2 f3 f4; f6 on f1 f2 f3 f4; f7 on f1 f2 f3 f4; f8 on f5 f6 f7; f9 on f8; x1 with x2 x3 x4 x5; x2 with x3 x4 x5; x3 with x4 x5; x4 with x5; f1 with f2 f3 f4; f2 with f3 f4; f3 with f4; f5 with f6 f7; f6 with f7; x1-x5 with f1-f9@0; f1-f4 with f5-f9@0; f5-f7 with f8-f9@0; f8 with f9@0; |
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It is unnecessary to include both ON and WITH statements for the same variables. For example: f9 on f8; and f8 with f9@0; Because f9 is a dependent variable, the WITH statement refers to the residual of f9. Such residuals are always uncorrelated with indepdent variables such as f8 as a default in Mplus. I would remove all of the WITH statements and run the model with the Mplus defaults. See what you get and go from there. |
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Hello, When I add one WITH statement between just two variables MPLUS sometimes automatically outputs many WITH statements among other variables in the model. When I remove the WITH statement all the others are no longer included in the output. Is this a bug or something I haven't picked up on? I have version 3.12. Thanks for your help. |
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This sounds strange. I would have to see it to commnent. Please send your inputs, data, outputs, and license number to support@statmodel.com. |
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