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RE: st: AW: confidence interval of a ratio of coefficients
From
"Nick Cox" <[email protected]>
To
<[email protected]>
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
[email protected]
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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