proportions: (a,b,c)/3 vs d?

Posted by Salbod on Nov 05, 2014; 3:45pm
URL: http://spssx-discussion.165.s1.nabble.com/proportions-a-b-c-3-vs-d-tp5727795.html

I have 4 proportions (N=111): a=.117 (n=13); b=.018(n=2); c=.099(n=11); and d(n=85)=.766. I want to know if d is significantly different from the average of a,b, and c. I don't have access to Marascuilo & McSweeney's book. I got Cohen 1967 article: An alternative to Marascuilo's "Large-sample multiple comparisons" for proportions. But, it involves an arcsin transformation of p. Is there a simple way to do this contrast using SPSS? I've got 36 of these contrasts to do.

z = ((a)+(b)+(c))/3 -1.0(d)/SE(?)  

Any suggestions will be greatly appreciated.

TIA Stephen Salbod, Pace University, NYC