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Re: st: tabstat, weights and correct standard errors of means


From   kayhop666 <kayhop666@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: tabstat, weights and correct standard errors of means
Date   Mon, 12 May 2008 06:33:34 -0700 (PDT)

Hi Svend,  Thanks for pointing this out.  Yes, that
was a misstatement.  My weights were incorrect and
giving me odd standard errors. 
Rob


--- Svend Juul <SJ@SOCI.AU.DK> wrote:

> Rob wrote:
>  
> I'm using tabstat with fweights to generate sample
> means of some variables.  Is there a simple method
> to
> get the correct standard errors for the means using
> tabstat? The default standard errors of the means
> are
> not sensitive to the use of weights and tabstat does
> not function with svy. I cannot use tabout in this
> case.
>  
>
====================================================================
>  
> What do you mean by "default standard errors are not
> sensitive 
> to the use of weights"? In the following example
> [fweight] 
> does influence SE:
>  
>      . sysuse auto
>      . tabstat price , by(foreign) stat(mean semean)
>  
>      Summary for variables: price
>           by categories of: foreign (Car type)
>  
>       foreign |      mean  se(mean)
>      ---------+--------------------
>      Domestic |  6072.423  429.4911
>       Foreign |  6384.682  558.9942
>      ---------+--------------------
>         Total |  6165.257  342.8719
>      ------------------------------
>  
>      . tabstat price [fweight=rep78] , by(foreign)
> stat(mean semean)
>  
>      Summary for variables: price
>           by categories of: foreign (Car type)
>  
>       foreign |      mean  se(mean)
>      ---------+--------------------
>      Domestic |  6162.517  256.1235
>       Foreign |  6133.778  236.4856
>      ---------+--------------------
>         Total |  6151.511  181.8117
>      ------------------------------
>  
> Svend
>  
>
________________________________________________________
> 
>  
> Svend Juul
> Institut for Folkesundhed, Afdeling for Epidemiologi
> (Institute of Public Health, Department of
> Epidemiology)
> Vennelyst Boulevard 6 
> DK-8000 Aarhus C,  Denmark 
> Phone, work:   +45 8942 6090 
> Phone, home:   +45 8693 7796 
> Fax:           +45 8613 1580 
> E-mail:        sj@soci.au.dk 
>
_________________________________________________________
> 
> 
> 
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