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st: Margins command to calculate elasticities using a heckman model
From
SIRENIA VAZQUEZ BAEZ <[email protected]>
To
[email protected]
Subject
st: Margins command to calculate elasticities using a heckman model
Date
Mon, 7 Oct 2013 10:21:52 -0500
Dear Statalist
I'm new with the -margins- command and I'm using it after running a
Heckman model in Stata 13. I'm working with the eyex() option to
estimate the elasticity of credit card purchases to credit cards
interest rates using panel data. My dependent variable is the amount
of credit card purchases, and as explanatory variables I have the
interest rate (with time lags), credit limit, sex, geographic region,
credit score, among others.
When I type margins, eyex(interest_rate) atmeans , I get the following results:
ey/ex = -3.120104
Std.Err. = 6.181389
z-statistic = -0.50
P|>z|= 0.614
It surprises me that the p-value is 0.614 since I thought -margins-
automatically excluded the covariates that are not significantly
different from 0 (p>.10), but apparently it doesn't. Do you know if I
should "clean up" my regression and exclude the non-significant
covariates before I run -margins-?
Many thanks,
Sirenia
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