Re: st: Cramers V with weighted data

[Steven Samuels <sjhsamuels@earthlink.net>]

I have to apologize to everyone.  The statistic computed by the  
formula that I gave is Cramer's Phi statistic, which is Cramer's V  
for 2x2 tables.    Thanks to Nick Cox for pointing out my error and  
pointing me to the proper definition.

The proper formula for Cramer's V is:


di "Cramer's V = "  sqrt(e(cun_Pear)/(e(N)*min((e(r)-1),(e(c)-1))))

-Steve
On Aug 14, 2008, at 10:47 AM, Waldo, Daniel R. (CMS/ORDI) wrote:


> In the case of complex survey design, should the denominator of the
> calculation take the design effect into consideration? That is,  
> should I
> use N/DEff as opposed to N?
> ------------------------------
>
> Date: Tue, 12 Aug 2008 08:34:30 -0400
> From: Steven Samuels <sjhsamuels@earthlink.net>
> Subject: Re: st: Cramers V with weighted data
>
> I did.
>
> Thanks, Paul.
>
> - -Steve
> On Aug 12, 2008, at 5:21 AM, Paul Seed wrote:
>
>
> > I think Steven meant:
> >
> > 	gen crV= sqrt(e(cun_Pear)/e(N))
> >
> > or:
> >
> > 	di "Cramer's V = " sqrt(e(cun_Pear)/e(N))
> >
> >
> > Paul Seed, Lecturer in Medical Statistics
> > KCL School of Medicine, Division of Reproduction and Endocrinology
> > tel  (+44) (0) 20 7188 3642
> >
> > > On Aug 8, 2008, at 12:21 PM, Steven Samuels wrote:
> > > .
> > > -svyset- the data with pweights equal to your weight. Run -svy:
> > > tabulate- and divide the uncorrected Pearson Chi Square statistic
> > > by the sample size.  You can program this by dividing the returned
> > > scalar e(cun_Pear) by the scalar e(N)
> > >
> > > gen crV= e(cun_Pear)/e(N)
> > >
> > > -Steve
>
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