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st: RE: RE: calculating means by group, with weights


From   "Shehzad Ali" <sia500@york.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: calculating means by group, with weights
Date   Wed, 25 Jun 2008 17:55:35 +0100

On the point raised by Nick: I have often seen people using aweights for
survey data. Is that wrong?

Shehzad


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: 25 June 2008 17:36
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: calculating means by group, with weights

A different issue: shouldn't survey weights be pweights? 

-----Original Message-----
From: Nick Cox 
Sent: 25 June 2008 17:23
To: 'statalist@hsphsun2.harvard.edu'
Subject: RE: calculating means by group, with weights

This is an FAQ. 

FAQ     . . Calculating variables containing weighted group summary
statistics
        . . . . . . . . . . . . . . . . . . . . .  N. J. Cox and S. P.
Jenkins
        1/03    I want to calculate a variable containing weighted
                group summary statistics, but I do not want to
                collapse the data and egen does not support weights.
                How can I do this?
                http://www.stata.com/support/faqs/data/weighted.html

Gisella Young

I am trying to calculate the mean of a variable ("income") across groups
("bracket"), but using the relevant survey weights (variable "weight").
I tried saying:

bys bracket: egen float meanincome = mean(income) [fweight=weight]

but this is not possible since the egen command does not allow for
weighting. This is a problem for me as if I do not use the weights the
means will be wrong. 


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