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From | Mirko <mirko.moro@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: differences in the ratios of coeffs of 2 nonlinear models |
Date | Tue, 18 Jan 2011 22:14:00 +0000 |
Dear all, I am wondering how to compute the statistical significance of the difference in the ratios of coefficients of 2 nonlinear models and if a Wald test is the right statistics in this case. Please see the example below where I split the sample between female and male and estimate a -clogit-. clogit choice X Y Z if female==1, group(choiceset) nlcom (ratio1: -(_b[X]/_b[Z])) (ratio2: -(_b[Y]/_b[Z])),post clogit choice X Y Z if female==0, group(choiceset) nlcom (ratio3: -(_b[X]/_b[Z])) (ratio4: -(_b[Y]/_b[Z])),post Now, I'd wish to test ratio1=ratio3 and ratio2=ratio4. Unfortunately, this cannot be done by using -test- because the results from the -nlcom- relative to the first model are "lost" after estimating the second -clogit-. Any ideas on how to do this? Thanks Mirko * * 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/