Hi everybody, I used a GEE model for repeated measures to analyse the following data (CSV file attached): . 2 groups, 5 days . One binary response variable (yes/No). The code is the following: proc genmod data=DATASET rorder=internal descending;
class GRP DAY ID;
model TO_EXPLAIN = GRP DAY GRP*DAY / dist=bin link=logit type3;
repeated subject=ID / type=ind withinsubject=DAY;
run; I have the following message errors: NOTE: Algorithm converged.
WARNING: The generalized Hessian matrix is not positive definite. Iteration will be terminated.
ERROR: Error in parameter estimate covariance computation.
ERROR: Error in estimation routine. It seems that these erros come from the fact that no subject show the modality "Yes" on Day 5 in both groups. How can I analyse these data? Thanks in advance for your help. Best,
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