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trying to remember my college stats class while doing some data analysis for the organization I work for. I'm trying to find out which groups of people (gender, age) our program is most effective for. We have a basic survey (Coping Self-Efficacy Scale, Chesney et al. 2006) that has three subscales. Participants took the survey pre- and post-program. Unfortunately, we don't have more follow-up data :(

Is it possible/a valid statistical procedure to run a moderation analysis on each subscale with gender or age as a moderator? I.e. Relationship between subscale1 at T1 with subscale1 at T2 as moderated by gender?

Here's the R code I'm using, where CoA is a subscale and the number is the timepoint (CoA1 or CoA2):

> uk <- read.csv( ...)
> attach(uk)
> summary(lm(CoA2 ~ CoA1+gender+CoA1*gender))

Thank you for the help!

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