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st: zero inflated poisson (zip)


From   Marie-Claire Robitaille-Blanchet <marie-claire.robitaille-blanchet@uwa.edu.au>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: zero inflated poisson (zip)
Date   Tue, 17 May 2011 15:49:34 +0800

Dear Statalister,

I am using a zero-inflated poisson to estimate a gravity model of bilateral trade.

* For the poisson-part of the model, the coefficient for the log of distance is: -0.7039
* For the probit-part of the model, the coefficient for the log of distance is: 0.1549

I understand how to interpret separately those coefficients but I am wondering if there is any way I can create one comprehensive measure for the total impact of distance on bilateral trade. Any reference?

Any help would be highly appreciate!

Thanks

Marie-Claire

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