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Re: st: interpretation of disappearing siginifcance after adding interaction term


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>, "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: interpretation of disappearing siginifcance after adding interaction term
Date   Sun, 10 May 2009 20:46:45 -0500

At 07:19 PM 5/10/2009, moleps islon wrote:
How do I interpret the finding of disapperance of significance after
adding an interaction term ??


logistic infection sex age
...higly significant sex-beta while age is non significant...

gen sex_age=sex*age

logistic infection sex age sex_age
..no sigificant betas...

Not that unusual.  See

http://www.nd.edu/~rwilliam/xsoc63993/l53.pdf

Pay close attention to the point made at the bottom of p. 3. As noted in the handout, centering age is one way to make the results easier to interpret.


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Richard Williams, Notre Dame Dept of Sociology
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