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st: running a backward stepwise multivariate analysis on my specific dataset


From   Scott Gilmore <skotchka@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: running a backward stepwise multivariate analysis on my specific dataset
Date   Wed, 3 Dec 2008 08:32:32 -0800 (PST)

Hi I'm new here and I could really use some help:

I have a dataset of N=50 patients and 20 variables.  13 are categorical and 7 are continuous variables.  I have no missing values.  My outcome is one of the variables and it is a binary outcome, 1= yes disease, 0= no disease.
 
I want to run an analysis for multivariate predictors of disease.  Using logistic regression and doing a backwards stepwise multivariate analysis.
 
I used the commands:
sw logistic var1 var2 var3 var4 var5, pr(0.5)
 
where var1=the outcome variable (binary)
var2= categorical (1,2,3,4,5)
var3= continuous
var4= categorical
and so forth.
 
I am not sure how to interpret the Odds Ratio and don't quite understand what I am getting.
 
Can someone please explain to me how to run a backward stepwise multivariate analysis on my specific dataset.
 
thank you!



      
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