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From | "Dr. Bill Westman" <webicky@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: Logistic regression interpretation |
Date | Tue, 21 Sep 2010 14:36:12 -0700 |
Dear Listers: I have more of a stats question than a stata question, but here goes: A simple logistic regression was run - outcome - Survived/Non Survived (1/0), with Group(Treatmeant/Control -- 1/0) & Risk(High/Low -- 1/0) The results ------------------------------------------------------------------------------ Survived | Odds Ratio Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- Risk | 4.790295 2.589136 2.90 0.004 1.660699 13.81763 group | 2.111181 .9107981 1.73 0.083 .9063649 4.917538 ------------------------------------------------------------------------------ Assuming the .10 level of significance was acceptable (for discussion purposes) Can I assume that odds of treatment survival were 2.1 times higher in the treatment Group for LOW risk patients? And for High Risk patients in the treatment group is the adds 4. 8 + 2.1 (or 6 times higher)? Other than test for interactions, can I run a graphs of these two groups? Can I estimate the "average" effect of Treatment across both high and low risk patients? If so, how? What other tests might I wish to do in Stata? Thanks Bill * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/