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st: a question on the weighted regression


From   Toyoto Iwata <iwata@med.akita-u.ac.jp>
To   statalist@hsphsun2.harvard.edu
Subject   st: a question on the weighted regression
Date   Tue, 03 Aug 2004 17:29:55 +0900

Antonio would have meant to post this mail to the Statalist,
so I send here.


> "Antonio Rodrigues Andres" <ara@sam.sdu.dk>
> 
> I have  a panel data set for 15 countries over the period 1970-1998. My
> dependent variable is the mortality rate. Since the variance of ln(d/p)
> is inversely proportional to p (population), this implies
> heteroskedasticity. To correct for it, observations should be weighted
> by the square root of the denominator of the mortality rate, i.e.,
> population. In Stata, 
> i am using 
> xi: regress y x1 x2 i.country i.year [w=1/pop], 
> Is that correct? I might also use the robust option
> I would appreciate your answer
> Antonio
> 

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