| Date: | Fri, 10 Feb 2006 03:01:36 +0000 |
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| Reply-To: | S Crawford <sgthomson99@hotmail.com> |
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| Sender: | "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU> |
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| From: | S Crawford <sgthomson99@hotmail.com> |
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| Subject: | Odds ratio question |
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| Content-Type: | text/plain; format=flowed |
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Hi, everyone.
I'm having problems with an odds ratio from a logistic regression. We are
trying to predict a binary outcome (yes or no) based on one continuous
variable (variable X). We get a significant overall regression. The B
coefficient for this variable was -.144, and Exp(B) from the SPSS printout
for variable X was .866.
If we want to find out the change in odds for every 10 point increase in
variable X, do we just take:
.866 and raise it to the 10th power?
That would be .23 rounding off - so does that mean a 23% decrease in odds of
an abnormal outcome for every 10 point increase in variable X?
Many thanks for the help.
Susan
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