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


From   Shehzad Ali <drshehzad_ali@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: AW: confidence interval of a ratio of coefficients
Date   Wed, 7 Apr 2010 16:25:48 +0000 (GMT)

Thanks, Martin. As always, spot on!

Shehzad



----- Original Message ----
> From: Martin Weiss <martin.weiss1@gmx.de>
> To: statalist@hsphsun2.harvard.edu
> Sent: Wed, 7 April, 2010 17:01:17
> Subject: st: AW: AW: confidence interval of a ratio of coefficients
> 
> 
<> 

BTW, if the name of the coefficients should pose a problem 
> for you, you should make frequent use of the -coeflegend- option, also available 
> on -replay-:


*************
sysuse auto, clear
logit foreign 
> rep78 price weight
logit, coefl
nlcom (ratio: 
> _b[price]/_b[weight])
*************



HTH
Martin


-----Ursprüngliche 
> Nachricht-----
Von: > href="mailto:owner-statalist@hsphsun2.harvard.edu";>owner-statalist@hsphsun2.harvard.edu 
> [mailto:> href="mailto:owner-statalist@hsphsun2.harvard.edu";>owner-statalist@hsphsun2.harvard.edu] 
> Im Auftrag von Martin Weiss
Gesendet: Mittwoch, 7. April 2010 17:53
An: > ymailto="mailto:statalist@hsphsun2.harvard.edu"; 
> href="mailto:statalist@hsphsun2.harvard.edu";>statalist@hsphsun2.harvard.edu
Betreff: 
> st: AW: confidence interval of a ratio of coefficients


<> 
> 



*************
sysuse auto, clear
logit foreign rep78 price 
> weight
nlcom (ratio: 
> _b[price]/_b[weight])
*************



HTH
Martin


-----Ursprüngliche 
> Nachricht-----
Von: > href="mailto:owner-statalist@hsphsun2.harvard.edu";>owner-statalist@hsphsun2.harvard.edu 
> [mailto:> href="mailto:owner-statalist@hsphsun2.harvard.edu";>owner-statalist@hsphsun2.harvard.edu] 
> Im Auftrag von Shehzad Ali
Gesendet: Mittwoch, 7. April 2010 17:50
An: 
> Stata List
Betreff: st: confidence interval of a ratio of 
> coefficients

Dear listers,

I am modelling choice behaviour using a 
> logit model. I want to calculate the marginal rates of subsititution of the 
> attributes of choice alternatives by taking the ratio of coefficients (similar 
> to what people do when calculating willingness to pay estimates by taking 
> attribute/cost coefficients). I need help with calculating the confidence 
> interval around the ratio of two coefficients.

Any help would be 
> appreciated.
Shehzad


      

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