Date:         Sun, 27 Nov 2011 02:57:27 -0800
Reply-To:     Joe <joedragy@YAHOO.COM>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Joe <joedragy@YAHOO.COM>
Subject:      Inconsistent Beta Coefficient Sign Between Multiple and Simple
              Regression
Content-Type: text/plain; charset=us-ascii

I am conducting a multiple Linear regression with 3 predictors, all variables
are continuous and N=51.  Before doing linear regression analysis, I did
first a simple linear regression and found that all the predictors have
positive correlation with the outcome variable.
Surprisingly, when I did the multiple linear regression, one of the
predictors have negative B unstandardized coefficients, with less than -1.0
coefficient, VIF value less than 10, and these are no indication of
multicollinearity problem.

Is there anything wrong with the result? Please kindly give any advice how
to explain this case.

Thank you.
Joe

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