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2007 May 08
0
Question on bivariate GEE fit
...mn names var1 var2 Unit time trt (trt represents the treatment) Now suppose I want to fit a joint model of the form for the *i* th unit var1jk = alpha1 + beta1*timejk + gamma1* trtjk + delta1* timejk:trtjk + error1jk var2 = alpha2 + beta2*timejk + gamma2* trtjk + delta2* timejk:trtjk + error2jk where j index time and k index the treatment received Using indicator variables I have been able to fit and run the code for a bivariate model using unstructured covariance matrix. However, I want to fit a model for a structured variance covariance matrix. The error structure for the grouping uni...