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Re: st: question about weights in histograms


From   "Scott Cunningham" <scunning@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: question about weights in histograms
Date   Thu, 11 Oct 2007 07:41:28 -0500

Thank you Steve and Austin for these recommendations.

On 10/10/07, Steven Joel Hirsch Samuels <sjhsamuels@earthlink.net> wrote:
> Good call, Austin! All multiples of the original weight will give the
> same result for means and percentages.
>
> -Steve
> On Oct 10, 2007, at 12:44 PM, Austin Nichols wrote:
>
> > Or, better, multiply the weight by the reciprocal of the smallest
> > increment ("units" in -codebook- output) and use that as a frequency
> > weight, which should give you identical point estimates to -svy-
> > output:
> >
> > use hhinc mars using cpsmar07
> > g double wt=round(marsupwt*100)
> > hist hhinc [fw=wt], xscale(log) percent
> >
> > On 10/10/07, Steven Joel Hirsch Samuels <sjhsamuels@earthlink.net>
> > wrote:
> >> Round the weights to the nearest integer and use these as frequency
> >> weights.  -histogram- is not a survey command and so is unaffected by
> >> -svyset-.   The results will be nearly identical to  what you would
> >> get if you estimated  the per cent in each category using -svy:
> >> proportion-.  By the way, in most complex surveys the weights have
> >> been trimmed to reduce total error: bias^2 + se^2.  So you cannot
> >> expect 'unbiased' estimates even with the original weights.
> >>
> >> -Steve
> >>
> >> On Oct 10, 2007, at 12:02 PM, Scott Cunningham wrote:
> >>
> >>> I am using 5% Census and March CPS data (United States) to construct
> >>> histograms.  These data include probability weights.  I know that
> >>> histogram can adjust for frequency weights, but apparently not
> >>> explicitly for probability weights that are not integers.  If I
> >>> -svyset- the data using the perweight, will -histogram- construct
> >>> unbiased estimates of the population?  Here is my code
> >>>
> >>> . svyset [perweight=perwt]
> >>> . histogram tax, by(white, col(1)) percent
> > *
> > *   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/
>
> Steven  Samuels
>
> sjhsamuels@earthlink.net
> 18 Cantine's Island
> Saugerties, NY 12477
> Phone: 845-246-0774
> EFax: 208-498-7441
>
>
>
>
> *
> *   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/
>


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