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st: RE: Percent distribution using the pweight


From   "Jann Ben" <ben.jann@soz.gess.ethz.ch>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Percent distribution using the pweight
Date   Wed, 24 Aug 2005 22:56:55 +0200

Ying wrote:
> I want to create the percent distribution (both percent and 
> frequency are
> needed). 
...
> However, the tab command doesn't allow the pweight.

Use aweights. They provide the same results in this case as 
would pweights, were they allowed. Using tabulate with aweights 
is ok as long as you are only interested in the raw frequency
distribution. However, if you are interested interested in test 
statistics or confidence intervalls or alike, you should think 
about using, e.g., svytab (type -help svytab-).

On pweights, aweights and means, see 
http://www.stata.com/support/faqs/stat/supweight.html

> BTW, is the fweight the inverse of the pweight?

No. fweights are frequency weights. They indicate how many 
times a specific case (i.e. a specific combination of values) 
occurs in your sample.

ben 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu 
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of 
> wying1@umbc.edu
> Sent: Wednesday, August 24, 2005 10:23 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Percent distribution using the pweight
> 
> 
> Dear list users,
> 
> I want to create the percent distribution (both percent and 
> frequency are
> needed).  I need sth. like:
> 
> 
> . tab hhldpov1
>     Poverty |
>   status on |
>     monthly |
>  threshold: |
>           1 |
> (<100%),2{1 |
> 00%,200%),3 |
>     {200%)' |      Freq.     Percent        Cum.
> ------------+-----------------------------------
>           1 |     14,062       13.57       13.57
>           2 |     20,343       19.63       33.20
>           3 |     69,210       66.80      100.00
> ------------+-----------------------------------
>       Total |    103,615      100.00
> --------------------------------------------------------------
> ----------
> 
> However, the tab command doesn't allow the pweight.
> 
> So I did.
> 
> ---------------------------------------------------------------------
> 
> . table hhldpov1 [pweight =whfnwgt], format(%12.0g)
> 
> ------------------------
> Poverty   |
> status on |
> monthly   |
> threshold |
> : 1       |
> (<100%),2 |
> {100%,200 |
> %),3{200% |
> )'        |        Freq.
> ----------+-------------
>         1 |  5.81216e+11
>         2 |  8.55400e+11
>         3 |  3.01133e+12
> ------------------------
> --------------------------------------------------------------
> -----------
> 
> This only shows the frequency but not the percent.  I know I 
> can simply
> calculate the percent distribution by excel, but it would be 
> nice to have
> it directly from the Stata output.  Can somebody help me with this?
> 
> BTW, is the fweight the inverse of the pweight?
> 
> 
> 
> Many thanks,
> Ying
> 
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