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Donna posted on Thursday, February 07, 2013  3:37 am



Hi Linda and Bengt, Using SEM, I would like to build a mediation model where the mediation variable represents change over time across two time points the model has: x measured at time 1 m1 measured at time 2 m2 measured at time 3 y measured at time 4 Can I build the m difference as (m2  m1) or should I use latent curve analysis? Is there an example in the manual that covers a similar model? Grateful for your advice. 


I think you should use one of the following models not a difference or latent curve analysis: x > m1 > m2 > y or x > m1 > y x > m2 > y 

Donna posted on Thursday, February 07, 2013  2:26 pm



Thank you, is there an example in the manual on how to build the top model ? Thanks again 


It would be y ON m2; m2 ON m1; m1 ON x; 

Donna posted on Friday, February 08, 2013  8:37 am



Thanks Linda 

Donna posted on Monday, February 11, 2013  7:20 am



Hi Linda, one more question. I would now like to see if my mediation model (with 1 mediator) is moderated by a 4th variable, which was measured at the same time as the mediator... How do I include this moderator in the mediation model ? Thank you 


For categorical moderator, you can use multiple group analysis or include and interaction term. For a continuous modeator, you would include an interaction term, for example, y ON m z mz; m ON x; 

Donna posted on Tuesday, February 12, 2013  2:09 am



Thanks again for such quick and helpful reply. 

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