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 Judy Black posted on Monday, December 10, 2012 - 9:04 am
Dear Dr. Muthen,

I would like to examine a moderation effect using change scores.

There are six observed variables: a1,a2,b1,b2,y1,y2.I would use these observed variables to create latent variables: change a = a2-a1; change b = b2-b1; change y = y2-y1;

Using these latent variables, I would like to examine the interaction effect between 'change a' and 'change b' on 'change y'.

I could create 'change a','change b',and'change y' in the MODEL command. My question is, how can I create the interaction item between 'change a' and 'change b'?

Thanks very much!

Best,
Judy
 Linda K. Muthen posted on Monday, December 10, 2012 - 4:51 pm
Why are the difference scores latent? Aren't they the difference between two observed variables?
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