hi Antonio
The square root will automatically be taken when you specify
regress y x1 x2 x3 [aweight=pop] see Techinical note on
Weighted regression page 343 N-R manual. So if you specify
gen wt=sqrt(pop)
regress y x1 x2 x3 [aweight=wt]
you will be doing this twice. I guess you don't want to do that..
Regards
Anthony
----- Original Message -----
From: "Antonio Rodrigues Andres" <[email protected]>
To: <[email protected]>
Sent: Tuesday, August 03, 2004 11:04 AM
Subject: Re: st: weigths
> i think that it is correct to use
>
> gen wt=sqrt(pop)
> regress y x1 x2 x3 [aweigth=wt]
>
>
> >>> [email protected] 08/03/04 10:41AM >>>
> 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 any answers
> > Antonio
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
