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Moderator analyses in OSMASEM

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Dabiriyan's picture
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Joined: 09/30/2019 - 07:42
Moderator analyses in OSMASEM
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Dear Mike & colleagues,
I conducted moderator analyses with OSMASEM with several moderators. When I performed OSMASEM with these moderators simultaneously and separately, it showed different estimates for moderators. Which one should be preferred?

I attached R-code and data.

Thanks for your time and patience.

Mike Cheung's picture
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Joined: 10/08/2009 - 22:37
Dear Dabiriyan,

Dear Dabiriyan,

This is similar to the case in multiple regression. The results are likely to be different when testing all predictors or one predictor at a time. In your case, only Individualism is statistically significant. You may focus on it.

Best,
Mike

> ## All moderators 
> anova(mx.fit1, mx.fit0)
             base   comparison ep  minus2LL df       AIC   diffLL diffdf          p
1 Ax as moderator         <NA> 18 -95.53248 42 -179.5325       NA     NA         NA
2 Ax as moderator No moderator  6 -73.93884 54 -181.9388 21.59365     12 0.04233461
> ## One moderator at a time
> anova(mx.fit1_Mean_Age, mx.fit0)
             base   comparison ep  minus2LL df       AIC    diffLL diffdf         p
1 Ax as moderator         <NA>  9 -74.75692 51 -176.7569        NA     NA        NA
2 Ax as moderator No moderator  6 -73.93884 54 -181.9388 0.8180842      3 0.8451368
> anova(mx.fit1_Individualism_Score_CON, mx.fit0)
             base   comparison ep  minus2LL df       AIC   diffLL diffdf         p
1 Ax as moderator         <NA>  9 -83.90478 51 -185.9048       NA     NA        NA
2 Ax as moderator No moderator  6 -73.93884 54 -181.9388 9.965939      3 0.0188579
> anova(mx.fit1_Female_Percentage, mx.fit0)
             base   comparison ep  minus2LL df       AIC   diffLL diffdf         p
1 Ax as moderator         <NA>  9 -76.67241 51 -178.6724       NA     NA        NA
2 Ax as moderator No moderator  6 -73.93884 54 -181.9388 2.733568      3 0.4345529
> anova(mx.fit1_Design, mx.fit0)
             base   comparison ep  minus2LL df       AIC   diffLL diffdf         p
1 Ax as moderator         <NA>  9 -78.74753 51 -180.7475       NA     NA        NA
2 Ax as moderator No moderator  6 -73.93884 54 -181.9388 4.808693      3 0.1863537
Dabiriyan's picture
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Joined: 09/30/2019 - 07:42
Thanks!

Dear Mike,
Thank you very much for your reply. I really appreciate it.