st: Box Tidwell procedure & Wald Chi2

["Cornelius Nattey" <cornelius.nattey@nioh.nhls.ac.za>]

Hi Maarten,
I know chi2 are used in contingency tables to check whether there is an association between exposure variable and outcome of interest
ie tab death agegrp,chi2  or exact  
What is the Wald X2?

Cornelius

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten buis
Sent: Monday, July 12, 2010 10:39 AM
To: statalist@hsphsun2.harvard.edu
Subject: RE: st: Box Tidwell procedure & Wald Chi2

--- On Mon, 12/7/10, Cornelius Nattey wrote:
> I want a help on the Box-Tidwell procedure in
> regression analysis. How different is the chi2
 test from Wald chi2 test

There exists no such thing as "The chi2 test", it is
a generic name for all test that use the assumption 
that the test statistic follows the chi square
distribution under the null hypothesis. So which
two tests are you comparing? A clear and concise way
of telling us that, is to tell us what you typed in 
Stata, and what it told you in return.

Hope this helps,
Maarten

Ps. I did not mean that you needed to start the
first line with <>, I meant that the first line
should _only_ contain <>. Your real post should
start on the next line. The statalist server 
sometimes removes the first line, so if deletes
your first line when you started it the way you
did, it would still remove substantive information
from your post, but if it removes it when you
started it the way I told you, it would only
remove two meaningless characters.

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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