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RE: st: AW: confidence interval of a ratio of coefficients


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: AW: confidence interval of a ratio of coefficients
Date   Fri, 9 Apr 2010 16:16:49 +0100

Even for another purpose, using -egen- to create a variable containing a
single mean is hideously inefficient. Use -su, meanonly- and pick up
r(mean) afterwards. 

Nick 
n.j.cox@durham.ac.uk 

Rodolphe Desbordes

Some leftover from another code. It is useless in that code.

Martin Weiss

What is your -egen- line good for?

Rodolphe Desbordes

Would this approach make sense?

sysuse auto, clear
set seed 2940688
logit foreign price weight rep78

preserve

drawnorm b1-b4, n(20000) means(e(b)) cov(e(V)) clear

gen ratio=-(b2)/(b1)

egen mean=mean(ratio)

_pctile ratio, p(2.5,97.5)
    gen ll=r(r1)
    gen ul= r(r2)

sum ratio ll ul

restore

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