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...;, sca.link="log", cor.link="fisherz") gee(number.absences ~ offset(log(risktime)), id=day.care.id, family=poisson, data=dcc, corstr="exchangeable") However it returns a value error of 1 ,in some cases it returnes NaN estimates, andin the case or gee, it hangs. We intend eventually to add other covariates we are interested in. Our clusters (day-care centers) include about 50 children each, and in one case over 100. By taking a smaller number of children in each day care center, we managed to obtain convergence, but as long as t...