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Doubts in Interaction analysis

Posted: Sun Aug 24, 2014 5:36 am
by umaganesh
Hi all, In my interaction analysis in smart pls, the beta value of the interaction term is negative (should be positive as per the model assumption), though the beta values of the moderator and the independent variable are positive. The t-value for all the 3 variables are significant and the r-squared value of the dependent variable also increases due to the moderating effect. Should we consider the negative beta while interpreting moderating effect or can we stick with change in r-squared value and ignore beta value? Please clarify.

Re: Doubts in Interaction analysis

Posted: Sun Aug 24, 2014 3:08 pm
by Hengkov
Hi,

You have collinearity problem, check it.

Regards,

Re: Doubts in Interaction analysis

Posted: Fri Oct 03, 2014 1:21 pm
by umaganesh
Thanks. Will do and get back.

Re: Doubts in Interaction analysis

Posted: Sat Oct 04, 2014 5:14 pm
by umaganesh
Hi
I did check for collinearity problems using SPSS and the VIF values for all my variables are above 1 and less than 5.

Re: Doubts in Interaction analysis

Posted: Sun Oct 05, 2014 1:52 am
by Hengkov
Hi,

If no have collinearity,this is supression effect. So, the sign change after you include moderation effect. For clear this issue may be you can asses Sympson Paradox Ratio.

Best regards,

Re: Doubts in Interaction analysis

Posted: Sun Oct 05, 2014 6:25 am
by umaganesh
will check out and get back. Thanks

Re: Doubts in Interaction analysis

Posted: Mon Feb 28, 2022 12:10 pm
by soralroy
i also think something is wrong with collinearity