Posted by
William B. Ware on
Jan 03, 2007; 2:30am
URL: http://spssx-discussion.165.s1.nabble.com/Sign-on-regression-coef-tp1072952p1072958.html
Lisa,
Look at the correlation between the two IVs. I'm going to guess that it
is pretty large... I think that what you have is a case of "suppression."
Check out one of the older editions of Cohen and Cohen or Cohen, Cohen,
Aiken, and West for an explanation...
wbw
__________________________________________________________________________
William B. Ware, Professor Educational Psychology,
CB# 3500 Measurement, and Evaluation
University of North Carolina PHONE (919)-962-7848
Chapel Hill, NC 27599-3500 FAX: (919)-962-1533
Office: 118 Peabody Hall EMAIL:
[hidden email]
Adjunct Professor School of Social Work
__________________________________________________________________________
On Tue, 2 Jan 2007, Lisa Stickney wrote:
> Hi SPSSers,
>
> First off, Happy New Year to all. Next, my apologies for posting a stats question & not an SPSS question, but I'm hoping someone can help me. I have 3 variables: 2 independent & 1 dependent. When I look at the correlation table, they all correlate positively with each other. However, when I put them in a regression, the regression coefficient on one of the independent variables becomes negative. Can anyone tell me when/why this might occur? Thanks in advance.
>
> Best,
> Lisa
>
> Lisa T. Stickney
> Ph.D. Candidate
> The Fox School of Business
> and Management
> Temple University
>
[hidden email]
>