General Estimating Equations Stata vs. SPSS

#1
Hi,

I am writing to request advice from anyone that has experience using both SPSS and Stata. I have used SPSS doing GEE but I could not get a value of Wald chi square so I turned to STATA. However, I am getting different coefficient values. From what I understand, STATA multiplies the variance-covariance matrix values with a particular number when it comes to robust estimators??? So, is it possible to get the same results?

Any advice would be deeply appreciated.

Thanks.