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From | "Michael Palmer" <Michael.Palmer@anu.edu.au> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | st: RE: saving coefficient matrix for two models |
Date | Wed, 23 Feb 2011 16:00:21 +1100 |
Dear all, I'm estimating a two part model (first part logit, second part log linear model) and am calculating the marginal effects which require coefficients from both models. The question is how to save coefficients from the two consecutive models. For example.. Logit hospital_visit $xlist Mfx Mat b = e(b) Reg Ln_hospital_expenditure $xlist Mat b = e(b) I presume 'display _b[age]' for example will give me the coefficient for second model but how to derive the same coefficient from the first model. Note the independent variables are the same for each model. I suppose I could rename the variables in the second model but hoping there is a simpler way. Any help would be appreciated. Many thanks, Michael Michael Palmer PhD Candidate National Centre for Epidemiology and Population Health The Australian National University Ph. 6125 0538 M. 0437 867 940 -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten buis Sent: Thursday, 3 February 2011 7:54 PM To: statalist@hsphsun2.harvard.edu Subject: RE: st: FW: Marginal effects for the two-part model --- On Thu, 3/2/11, Michael Palmer wrote: > There seems to be some confusion on the computation of marginal > effects for the TPM I described as some authors still suggest combined > marginal effects. That depends on what the outcome of interest is. If you want the unconditional outcome, for example people get 0 cost when they don't seek medical help and some positive cost when they do, then you need to include both parts of your model. However, as I understood your original question, you wanted the cost conditional on seeking medical help. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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/ * * 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/