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Re: st: Survey variance estimates - large software differences


From   sjsamuels@gmail.com
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Survey variance estimates - large software differences
Date   Tue, 30 Jun 2009 13:57:01 -0400

Sorry, the first sentence got truncated. It should start...

" We cannot judge the cause of the discrepancy since you do not show ...."


On Tue, Jun 30, 2009 at 1:52 PM, <sjsamuels@gmail.com> wrote:
> ==
> Arnold,
>
> Since you do not show the Stata -svyset- output, nor the Stata
> estimation commands and output, nor the equivalent SAS commands and
> output.  Please do so.  If there are so many variables as to make
> scanning the output difficult, please run the commands with as few
> variables as needed to demonstrate the issue. Best would be to use one
> of the downloadable example data sets from the Stata survey manual.
>
> -Steve
>
>
> On Tue, Jun 30, 2009 at 12:41 PM, Levinson,
> Arnold<Arnold.Levinson@ucdenver.edu> wrote:
>> Survey analysis experts:
>> I have data from a stratified two-stage school survey. The first stage sampled schools within strata, the second sampled classrooms within selected schools.
>>
>> When estimating variables of interest at the school level, I get hugely different variance estimates running Stata vs. SAS or SUDAAN. Stata's estimates are generally a lot smaller than SAS's or SUDAAN's, and the latter to are similar or identical to each other.
>>
>> My Stata svyset statement is:
>>
>> svyset skulid [pw=skulwt], strata(strat) fpc(fpc) || classid
>>
>> My SAS/SUDAAN design statements are the equivalent.
>>
> Steven Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> 845-246-0774
>



-- 
Steven Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
845-246-0774

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