Friday, March 03, 2006
st: marginal effects for ZINB with interactions and squared terms
I am estimating a model with interactions: a+b(x_1)+c(x_2)+d(x_1*x_2) and squared terms: e+f(z_1)+g(z_1)^2 using a zero-inflated negative binomial regression (ZINB) because of overdispersion and excess of zeros in the data.
Does anyone know how I can obtain marginal effects and their standard errors, given that mfx and margeff do not "know" that I have interactions and squared terms?
Thanks a lot! Francesco
Francesco Rullani Ph.D. Student, --Laboratory of Economics and Management, Sant'Anna School of Advanced Studies, Piazza dei Martiri della liberta, 33, 56127 Pisa, Italy. --CESPRI Bocconi University Via Sarfatti 25, 20136 Milan, Italy. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/
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