Doubts in Interaction analysis

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umaganesh
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Doubts in Interaction analysis

Post by umaganesh » Sun Aug 24, 2014 5:36 am

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.

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Hengkov
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Re: Doubts in Interaction analysis

Post by Hengkov » Sun Aug 24, 2014 3:08 pm

Hi,

You have collinearity problem, check it.

Regards,

umaganesh
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Re: Doubts in Interaction analysis

Post by umaganesh » Fri Oct 03, 2014 1:21 pm

Thanks. Will do and get back.

umaganesh
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Re: Doubts in Interaction analysis

Post by umaganesh » Sat Oct 04, 2014 5:14 pm

Hi
I did check for collinearity problems using SPSS and the VIF values for all my variables are above 1 and less than 5.

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Hengkov
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Re: Doubts in Interaction analysis

Post by Hengkov » Sun Oct 05, 2014 1:52 am

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.

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umaganesh
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Joined: Tue Aug 19, 2014 3:18 pm
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Re: Doubts in Interaction analysis

Post by umaganesh » Sun Oct 05, 2014 6:25 am

will check out and get back. Thanks

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