I am looking at two variables (income and race) . The levels are as follows:

Race %- Whites, AA, MA hispanics
Income
<$20,000 70.8 65.5 65.2
30-40k 13.7 15.2 12.8
40-60k 11.3 14.8 17.1
>=60K 4.2 4.6 4.9


I ran a Cochrane-MH test to see if they are associated or not and found out that they are (CMH =16.3, DF =6, p=0.03). My question is, how do I find out about where the difference actually lies, i.e., which proportions are significantly different? I am using SUDAAN.

Thanks.

Shahed