[R] Logistic Regression - Results?

[Marwan Khawaja]

Are you sure you are using the same contrasts in SPSS? You could have
supplied us with your spss syntax.

Marwan

----------------------------------------------
Marwan Khawaja   http://staff.aub.edu.lb/~mk36
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> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Wojciech Gryc
> Sent: Thursday, May 25, 2006 12:41 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Logistic Regression - Results?
> 
> Hi,
> 
> I use SPSS at work and have R installed both at work and on 
> my home machine.
> I've been trying to do some logistic regressions in R and 
> SPSS, but the results I'm getting are different. I've 
> followed a few R tutorials, and with most of them, I get the 
> following instructions:
> 
> result <- glm(z ~ x + y, family=binomial(logit))
> 
> In the case above, with three variables (z being dependent).
> 
> In SPSS, I'm told to use Analyze -> Regression -> Binary 
> Logistic, where I put x, y in "Covariates" and z in 
> "Dependent". Note that my values for x and y are either 1 or 0.
> 
> The results I get from these two tests are different, 
> however, and I was wondering why. Am I choosing the wrong 
> commands? If not, why are the results different? Any help 
> would be greatly appreciated, and please note that I have a 
> limited amount of stats knowledge.
> 
> Thanks,
> Wojciech
> 
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