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Re: st: prtest and survey weights
From
Steve Samuels <[email protected]>
To
[email protected]
Subject
Re: st: prtest and survey weights
Date
Sat, 13 Mar 2010 09:35:01 -0500
It's not clear which two proportions Omar wants to compare . If he
means correlated proportions (two attributes measured on the same
person), here's a way that uses -svy: tab-
**************************CODE BEGINS**************************
sysuse auto, clear
svyset _n
set seed 2000
gen u=uniform()
sort u
gen cat = _n<39 // new 2-level category
svy: tab foreign cat
test _b[p12] = _b[p21]
lincom _b[p12] - _b[p21]
***************************CODE ENDS***************************
If he means: test the equality of two cell proportions of the same
attribute, he can use -svy: prop- as Mary stated.
***************************CODE BEGINS**************************
sysuse auto, clear
svyset _n
svy: prop rep78
test _b[1] = _b[5]
lincom _b[1] - _b[5]
svy: prop foreign
test _b[Foreign] = _b[Domestic] //Use the category values shown in
the results
test _b[1] = _b[0] // Unlabeled values don't work
***************************CODE ENDS***************************
Steve
On Fri, Mar 12, 2010 at 2:20 PM, Mary E. Mackesy-Amiti <[email protected]> wrote:
> I believe you can use svy: proportion followed by test (post-estimation
> command).
>
> see: help proportion postestimation
>
>
> Omar McDoom wrote:
>>
>> Dear all,
>>
>> Does anyone know how I may compare two proportions drawn from a variable
>> in
>> a weighted survey? The svy command I understand is not available for
>> prtest. Is there a work-around that allows one to incorporate survey
>> design
>> effects/weights?
>>
>>
>>
>>
>
> --
> Mary Ellen Mackesy-Amiti, Ph.D.
> Research Assistant Professor
> Community Outreach Intervention Projects (COIP)
> School of Public Health m/c 923
> Division of Epidemiology and Biostatistics
> University of Illinois at Chicago
> ph. 312-355-4892
> fax: 312-996-1450
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
--
Steven Samuels
[email protected]
18 Cantine's Island
Saugerties NY 12477
USA
845-246-0774
*
* For searches and help try:
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