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st: RE: Calculate confidence intervals for log-log models
From
Jason Ferris <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: Calculate confidence intervals for log-log models
Date
Thu, 7 Mar 2013 22:46:47 +0000
Hello Paul,
Thank you for your solution. That is perfect.
Kind regards,
Jason
Date: Wed, 6 Mar 2013 10:26:14 +0000
From: "Seed, Paul" <[email protected]>
Subject: st: RE: Calculate confidence intervals for log-log models
The same result can be got in a simpler way.
Consider a well-known example:
*********** Start of Stata code ***********
clear
sysuse auto
gen ln_price = ln(price)
gen ln_mpg = ln(mpg)
regress ln_mpg ln_price
* effect of a 10% increase in price on mpg.
lincom `=ln(1.1)'*ln_price , eform
* The mpg falls on average by 3.4% to 96.6% of the original value.
* Alternative method
nlcom 1.1^_b[ln_price]
* The same confidence interval; but the test (t in particular)
* no longer agrees with that given by the regression.
*********** End of Stata code ***********
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