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We are currently analyzing data on children clustered in day care-centers (DCC). We have tried to use geepack and gee libraries to estimate an overall incidence rate for absences (=number of absences/risk time) by specifying geese(number.absences ~ offset(log(risktime)), id=day.care.id, family=poisson("log"), data=dcc, corstr="exch", sca.link="log", cor.link="fisherz") gee(number.absences ~ offset(log(risktime)), id=day.care.id, family=poisson, data=dcc, corstr=&quo...