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st: Re: Excuse me, just a question about chi-square test.


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   stata list <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Excuse me, just a question about chi-square test.
Date   Thu, 12 Mar 2009 14:02:42 +0000 (GMT)

--- On Thu, 12/3/09, Xu Kaikuo wrote to me privately:
> I saw your discussions on
> http://www.stata.com/statalist/archive/2007-09/msg00575.html,
> so I think you could provide some clue to my question. This 
> is a abstract of my problem, but not the real one.
> Assume we have two kind of fridges A and B, and a function
> set F = {f1,f2...,fn} and each function has its corresponding
> weight W = {w1,w2,...,wn}, I want test whether difference exist
> between A and B on cover the functions in F.
> 
> 1 I know that without the weight, we could do it like this:
> First create the 2*2 table
>                           A               B
> covered functions         a                c
> uncover functions         b                d
> 
> Then use chi-square test.
> But with the weight, what should I do.
>
> 2 How to test whether A covers more functions than B
> considering the weight.

First of all it is better to respond to the list than to
individual members privately, as is discussed on the 
statalist FAQ, point 5:
http://www.stata.com/support/faqs/res/statalist.html#private

As to question 1: -tab- allows weights, see: -help tab-.

As to question 2: In that case you probably want to do a 
logistic regression, with fridge type as an explanatory 
variable.

Hope this helps,
Maarten

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

http://home.fsw.vu.nl/m.buis/
-----------------------------------------




      

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