Testing Difference in Parameters PreviousNext
Mplus Discussion > Structural Equation Modeling >
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 Chelsea Jin posted on Monday, March 04, 2013 - 2:57 pm
Dear Drs. Muthen,

I have a question regarding how to test the difference between parameters.

Let's say - I have a equation, e.g.,

Y on X1 X2 X3;

The parameters of X1, X2 & X3 can be hence obtained - suppose that they are beta1 for X1, beta2 for X2, and beta3 for X3.

My purpose is to test the difference between beta1 & beta2 (beta2-beta1), beta1 & beta3 (beta3-beta1), and beta2 & beta3(beta3-beta2). My question is how to write codes in Mplus to obtain these differences.

I'd appreciate you would reply.
 Linda K. Muthen posted on Monday, March 04, 2013 - 3:45 pm
MODEL:

y on x1 (beta1)
x2 (beta2)
x3 (beta3);

MODEL CONSTRAINT:
NEW (diff);

diff = beta1 - beta2;

etc.
 Chelsea Jin posted on Tuesday, March 05, 2013 - 7:41 am
Thanks for your reply, Dr. Muthen. However, an error message occurred as

*** ERROR in MODEL command
Unknown variable(s) in an ON statement: (BETA1)

Do I have to define beta1, beta2, etc.? And how? I'd appreciate your reply.
 Linda K. Muthen posted on Tuesday, March 05, 2013 - 7:48 am
Please send your output and license number to support@statmodel.com.
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