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Re: st: testing 2 proportions using svytab


From   Nick Winter <nw53@cornell.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: testing 2 proportions using svytab
Date   Fri, 18 Feb 2005 11:51:57 -0500

I thin kit would be equivalent to do:

. svymean dummy if cat4==1
. test dummy=0.5

And similarly for the other values of cat4. That is, if the two proportions are equal, then the mean of the dummy variable will be 0.5.

--Nick

At 10:02 AM 2/18/2005 -0500, you wrote:

Hello all,

Hopefully I have solved this, but wanted to see if this made sense:

I asked:
> I am using svytab to look at different proportions of a 4 value
> category by an indicator variable:
>
> svytab dummy cat4,  row se
> ------------------------------
>    1   2   3   4
> 0   a   b   c   d
> 1   e   f   g   h
> ------------------------------
>
> test a==e, etc...
>
> I would like to test whether or not the row proportions for each
> category of cat4 are significant from the opposite by indicator. I
> assume I can do this using the standard error, but am unsure of how to
> code this.


after I :

svytab dummy cat4,  row format(%12.3f) se

I can then

test _b[p11]=_b[p21]
test _b[p12]=_b[p22]
.....etc

Is this test valid (variance-wise) for a test that two proportions
from the same survey are different, given the use of svytab?

Other relevant posts include:

http://www.stata.com/statalist/archive/2004-05/msg00975.html
http://www.stata.com/statalist/archive/2002-10/msg00420.html

Any help is appreciated,

Dan
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--------------------------------------------------------
Nicholas Winter 607.255.8819 t
Assistant Professor 607.255.4530 f
Department of Government nw53@cornell.edu e
308 White Hall falcon.arts.cornell.edu/nw53 w
Cornell University
Ithaca, NY 14853-4601

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