Date: Fri, 11 Jan 2008 08:41:53 -0500
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Art Kendall <Arthur.Kendall@verizon.net>
Subject: Re: Running a Stepwise Regression Model
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A stepwise regression is not usually a good idea.
some ideas to consider:
A. try using theory to reduce the number of predictors.
B. use some form of factor analysis (PCA or PAF) to get a smaller
number of predictors.
C. consider a stepped/hierarchical approach.
for each variable show
1) the zero-order correlation with the DV. i.e., 1 predictor at a time.
2) the b&beta when all 7 variables are in the equation - 7 predictors.
(fit when all are in at the same time)
3) the change in fit and b&beta when 6 variables are ENTERed in 1 step
and the 7th is ENTERed on the second step. Unique contribution to fit.
for syntax, case studies, and tutorials see the <help> command.
Social Research Consultants
Donna Daniels wrote:
> I am having difficulty running the Stepwise Regression Model on my SPSS
> 14 package. My dissertation research has seven independent variables
> that could be related to each other causing multicollinearity issues.
> To avoid multicollinearity, I chose the stepwise model. Could someone
> send me the command I need to use to make this work?
> Thank You,
> Donna Daniels
> Doctoral Candidate
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