Path Analysis with different groups a... PreviousNext
Mplus Discussion > Structural Equation Modeling >
 Orig posted on Monday, September 03, 2012 - 3:07 am

i want to run a path analysis and i got one dataset, for three groups:
treatment_1, treatment_2, control

the three groups only differ in an exogenous shock


the data contain the groups in form of two dummy variables as follows:

treat12 = 0 (treatment 1)
treat12 = 1 (treatment 2)

t1co = 0 (treatment 1)
t1co = 1 (control-group)


Treatment 2 is in the focus of the analysis. What i already got is a fitted model for the "Treatment 2-Analysis".

My problem is:
I want to know, if the effect of treatment 2 generated in a variable, differs from treatment 1, but i donīt know how to do this, when i just got these two dummies.


treat2 --> x ---> y

to account for treat1 :

treat1 --> y

but i dont know how to "build" the variable: treat1
 Linda K. Muthen posted on Monday, September 03, 2012 - 1:27 pm
It looks like you do your dummy variables incorrectly. Try:

tx1 = 0;
IF (treat1 EQ 1) THEN tx1=1;
tx2 = 0;
IF (treat2 EQ 1) THEN tx2=1;

y ON tx1 tx2;

The difference in the slopes is the difference in the treatment effects.
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