Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
st: Odd ratio / relative risk in logistic regression
From
Ching Wong <[email protected]>
To
[email protected]
Subject
st: Odd ratio / relative risk in logistic regression
Date
Tue, 9 Apr 2013 13:36:49 +0930
Hi,
My analysis involves two steps:
1. Chi-square testing:
I did a few chi-sqare testing with different variables.
-tab grade var1, chi2
-tab grade var2, chi2
-tab grade var 3, ch2 etc.
Basesd on the result of the chi-sqaure testings, the variables which
are significant (i.e. p<0.05) will then put into the logistic
regression.
2. logistic regression:
I put the command as followings:
- binreg grade var1 var3 var4 etc.
And I have got the following output.
Iteration 1: deviance = 113.0721
Iteration 2: deviance = 92.10798
Iteration 3: deviance = 87.45499
Iteration 4: deviance = 86.88055
Iteration 5: deviance = 86.86395
Iteration 6: deviance = 86.86393
Iteration 7: deviance = 86.86393
Generalized linear models No. of obs = 297
Optimization : MQL Fisher scoring Residual df = 294
(IRLS EIM) Scale parameter = 1
Deviance = 86.86392755 (1/df) Deviance = .2954555
Pearson = 311.8670508 (1/df) Pearson = 1.060772
Variance function: V(u) = u*(1-u/1) [Binomial]
Link function : g(u) = ln(u/(1-u)) [Logit]
BIC = -1587.093
------------------------------------------------------------------------------
| EIM
grade | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
var1 | 2.955512 1.066853 2.77 0.006 .8645186 5.046506
var4| .4058033 1.07797 0.38 0.707 -1.70698 2.518587
_cons | -4.464928 .6125685 -7.29 0.000 -5.665541 -3.264316
------------------------------------------------------------------------------
In this case, I can tell var 1 is significant in the logistic
regression model, since it has a p-value =0.006. However, how can I
find out the odd ratio or the relative risk of this model? Did I use
the wrong command?
Thanks.
Regards,
Wong
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/