Re: Testing the difference between two correlated proportions from one sample

Posted by Bruce Weaver on Jul 04, 2013; 12:33pm
URL: http://spssx-discussion.165.s1.nabble.com/Testing-the-difference-between-two-correlated-proportions-from-one-sample-tp5720999p5721010.html

Maybe I just need more coffee.  I know what mutually exclusive categories are, but what are mutually exclusive proportions?  

Your description suggests a 2x2 table like this:

          B-Yes  B-No
A-Yes    a        b
A-No     c        d

For that table, the usual test is the McNemar chi-square (available via CROSSTABS).  It tests the null hypothesis that b = c.*  Therefore, it also tests the null that (a+b)/N = (a+c)/N.

* In fact, it is equivalent to a chi-square goodness of fit test on the b and c cells with (b+c)/2 as the expected count in each cell.

HTH.

mils wrote

Hi SPSS gurus!

Does anyone know how to Test the difference between two correlated proportions from one sample where the proportions are mutually exclusive, using SPSS?

I was wondering if I can test the following proportions:

Product A 235 78.33%
Product B 65 21.67%
       
n=300
p1=78.33%
p2=21.67%
95% level of significance

Let me know if you need more information. Thanks in advance.