Covariance of two binary variables in survey data

[ThanhUSF]

Could anyone please help me the way to calculate the covariance of two dichotomous variable in survey data please. Thank you very much.

[stat_sas]

Hi,

Why covariance? What are trying to study based this?

[ThanhUSF]

From my literature review, I need to adjust the coeficient of a logistics regression which requires the calcilation of covariance between 2 variables. In my case both a binary. Since my data are survey data, I need to use proc surveyreg but couldn't figure out the way to calculate the covariance with proc surveyfreq. Hope that helps. 

[Ksharp]

If I was right, I remember PROC DISTANCE can do this.

[ThanhUSF]

Thank you for helping. I think  Proc Distance are for random sampling data since it doesn't provide the options for variance estimate such as BRR method in other proc survey