Date: Fri, 17 Sep 2010 07:57:48 -0700
Reply-To: Bruce Weaver <bruce.weaver@hotmail.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Bruce Weaver <bruce.weaver@hotmail.com>
Subject: Re: crosstabs/chisquares/correlations
In-Reply-To: <FB853DBF9AC04B628E63C53F976CE573@yourg2asvv4l2m>
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John F Hall wrote:
>
> AFAIK chi-square can be used with anything, but 2 x 2 tables may be a
> special case where a different (chi-square based) statistic might be
> appropriate. Have a look at Jim Ring's specially written notes:
> http://surveyresearch.weebly.com/statistics-notes-to-accompany-course.html
>
> Chi-square is sensitive to sample size: I used to have rule of thumb that
> it will be significant once you got 200 or more cases (and Pearson's r has
> a maximum of 0.707 with 3 x 3 tables) but I could be wrong. No doubt one
> of the regulars will give a better answer.
>
> John Hall
> johnfhall@orange.fr
> http://surveyresearch.weebly.com
>
>
John is right on both counts. The chi-square test of association can be
used for tables larger than 2x2 (when certain conditions are met); and the
2x2 table is a special case where there are better options than the ordinary
test. I have some notes you might find useful.
https://sites.google.com/a/lakeheadu.ca/bweaver/Home/statistics/notes/chisqr_assumptions
Cheers,
Bruce
-----
--
Bruce Weaver
bweaver@lakeheadu.ca
http://sites.google.com/a/lakeheadu.ca/bweaver/
"When all else fails, RTFM."
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To send me an e-mail, please use the address shown above.
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