```Date: Fri, 10 Feb 2006 03:01:36 +0000 Reply-To: S Crawford Sender: "SPSSX(r) Discussion" From: S Crawford Subject: Odds ratio question Content-Type: text/plain; format=flowed 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 _________________________________________________________________ Scan and help eliminate destructive viruses from your inbound and outbound e-mail and attachments. http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=http://hotmail.com/enca&HL=Market_MSNIS_Taglines Start enjoying all the benefits of MSNŽ Premium right now and get the first two months FREE*. ```

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