Mplus user guide example 11.4 PreviousNext
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 Michael Lawton posted on Friday, September 15, 2017 - 6:23 am
I am relatively new to Mplus and pattern-mixture modeling (PMM) and have a question about the PMM example in the Mplus user guide, that is example 11.4.

In a non Structural Equation Modelling framework when carrying out a PMM one would need to carry-out post estimation manipulation of the parameter estimates to get the average intercept and slope (see following document

Is this not necessary within Mplus? For instance in example 11.4 (see output file on mplus website) is the average intercept accounting for dropout 1.903 and the average slope -1.123? So I do not need to use the estimates of I on d1-d5 post estimation to calculate the average intercept?

Thanks for your time.
 Bengt O. Muthen posted on Friday, September 15, 2017 - 6:08 pm
The intercept of e.g. i is not the mean of i. If you want the mean i and s you have to take into account the effects of the d variables. You can do this using the Model Constraint command with parameter labels given in the Model command.
 Michael Lawton posted on Monday, September 18, 2017 - 2:26 am
Many thanks for your quick response. Is this what I would need to do to get the mean of I?

MODEL: i s | y0@0 y1@1 y2@2 y3@3 y4@4 y5@5;
i ON d1-d5 (p1-p5);
s ON d3-d5;
s ON d1 (1);
s ON d2 (1);
[i] (a);
[d1-d5] (m1-m5);
int = a + m1*p1 + m2*p2 + m3*p3 + m4*p4 + m5*p5;
 Bengt O. Muthen posted on Tuesday, September 19, 2017 - 3:23 pm
This looks right.
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