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st: Using Margins within a Bootstrapped Program


From   "Stephen Kay (CWW)" <steve.kay@completeworldwide.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Using Margins within a Bootstrapped Program
Date   Fri, 26 Aug 2011 16:04:46 +0100

I'm trying to generate a graph showing bootstrapped confidence intervals
of predicted probabilities (Y axis) from a logit model with price on the
X axis.
There are many ways of doing this but can someone please tell me why the
following command returns a "no observations" error message, and can
they suggest how it can be remedied without taking out the Margins
command. 

sysuse auto,clear

program define ste, eclass
logit  foreign price mpg 
margins, at(mpg=21.29 price=(3000(1000)12000)) nose
tempname bb
matrix `bb' =r(b)
ereturn post `bb'
ereturn local cmd="bootstrap"
end

bootstrap _b, reps(10): ste

Many thanks,

Steve







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