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


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: confidence interval of a ratio of coefficients
Date   Fri, 9 Apr 2010 13:00:46 -0400

Martin-

I left out rep78.

On Fri, Apr 9, 2010 at 10:35 AM, Martin Weiss <martin.weiss1@gmx.de> wrote:
>

> " The bootstrap command should have been:
> bootstrap ratio = (-_b[price]/_b[weight]), rep(500): logit foreign
> price weight rep78"
>
Shehzad:

The first variable in the list will be the denominator coefficient.
Note that  -wtp-  estimates minus the ratio.  You can programmatically
change the signs by extracting the ratio and confidence limits from
the returned matrix r(wtp).

Steve
Is this correct that Arne's -wtp- module can be used for ratio of a
set of any two coefficients, i.e. one of the coefficients doesn't
necessarily have to be associated with cost?
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