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Re: st: t-test command for simple cross-tabs


From   "Hoang Thanh Huong" <hhuongneu@cardvn.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: t-test command for simple cross-tabs
Date   Wed, 26 May 2004 09:10:54 +0700

Dear all,

When comparing two proportions from the same survey, I first use command
"svyset" that taking survey design into account. After that I execute a
command "svytab X Y, per se".

Hope this works.

Best,
Hoang Thanh Huong

----- Original Message -----
From: "Nick Cox" <n.j.cox@durham.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, May 26, 2004 3:23 AM
Subject: RE: st: t-test command for simple cross-tabs


> There were two interesting articles in TAS which may be relevant.
>
> Comparing Two Proportions from the Same Survey.
> C.J. Wild; G.A.F. Seber
> The American Statistician 47 (Aug. 1993), 178-181.
>
> Difference of Proportions from the Same Survey.
> A.J. Scott; G.A.F. Seber
> The American Statistician 37 (Nov. 1983), 319-320.
>
> As I recall, however, neither boils down to a t-test.
>
> I was very interested in these papers when I read them,
> but never focused on how to do either in Stata. Irrespective
> of whether either is the answer to Claudia's question,
> I would be happy to learn of Stata implementations.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Claudia Solari
>
> > Thank you so much for your response.  It is my understanding that a
> > chi-square test can tell me if the relationship between two
> > variable is
> > significant, lets say region (ne, mw, w, s) and age cateories (19-29,
> > 30-34, 35+).  The chi-square refers to whole variables, and
> > the t-test is
> > based on the categories, such as proportion in a cell (means or
> > percentages).  So, I might want to know if there are significant
> > differnences in age for those who live in the NE versus the South.
> >
> > I know of a free software package that calculates my t-tests
> > (STATS), but
> > I'm not sure how to make STATA do it.   I was unable to reach the url
> > that you indicated, so I am not sure if my email is redundant.  If you
> > have any further comments, I would love to hear them.
>
> Richard Williams
>
> > > I'm probably showing my ignorance here, but what do you want to do a
> > > t-test
> > > of, and how would it differ from what the chi-square test
> > tells you?  In
> > > the special case of 2 X 2 tables, it is possible to do a
> > z-test using the
> > > -prtest- command; see p. 7 of
> > > http://www.nd.edu/~rwilliam/stats1/Categorical-Stata.pdf.  Is that
> > > what you
> > > want, or do you have something else in mind?  If
> > occupational status is a
> > > continuous variable, you could of course just use the
> > t-test command.
>
> Claudia Solari
>
> > > >I am just trying to find out the command to conduct a
> > t-test for a simple
> > > >crosstab, such as gender by occupational status. I know
> > there is a simple
> > > >command for the chi-square test, wihc is just an option
> > for the tabulate
> > > >command, but I have not found an option for a t-test.
>
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>

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