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Re: Testing the significant difference in Proportions

by Bruce Weaver :: Rate this Message:

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Jims More wrote:
I have two categorical variables.  One is the response variable, a yes/no variable.  The other is a categorical predictor variable which has 5 categories.  The proportion table of the gathered data (n=5000) looks like as follows:
 
                         Row % of Yes Response           Row % of No Response
Category1                .40                                    .60
Category2                .30                                    .70
Category3                .80                                     20
Category4                .40                                    .60
Category5                .34                                    .66
 
How to test using SPSS if the proportions of Yes and No are significantly equal for each category?
 
Thank you for any help.
Jims
You can always roll your own, like this:

data list list / cat (f2.0) x N (2f6.0).
begin data
1 40 100
2 30 100
3 80 100
4 40 100
5 34 100
end data.

compute p = x/N.
compute se = SQRT( p*(1-p)/N).
compute z = (p - .5)/se.
compute pvalue = 2*(1-(CDF.NORMAL(abs(z),0,1))) .
format se pvalue (f5.3).
list.

You'll have to fill in the correct values of X and N, of course.
--
Bruce Weaver
bweaver@lakeheadu.ca
http://sites.google.com/a/lakeheadu.ca/bweaver/
"When all else fails, RTFM."

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