[R] Problems on testing moderating effect (or interactive effect).

From: Guo Wei-Wei <wwguocn_at_gmail.com>
Date: Tue 04 Jul 2006 - 13:38:31 EST


Hi everyone,

I want to do test on moderating effect. I have three factors, A, B, and C. A has influence on B, and C moderating the influence. The relationship looks like this:

A -----> B

     ^
     |

    C

A, B, and C are all scale variables. I think I can test the moderating effect by adding a interactive variable between A and C. But I'm not sure how to do.

Is there a default way to do it in package sem?

I'm also thinking about create a interaction variable of A and C, but I don't know how to it. A has n (n = 27) items and p (p = 288) cases and C has m (m = 16) iterms and p (p = 288) cases.

Does anyone have any suggestion? Thanks in advance.



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