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2012 Aug 17
0
GEE with R: "double" overdispersion?
Dear R users, I work with a descrete variable (sclae 0 - 27) which is highly skwed to the right (many zeros and small numbers). I measure this variable on a control and intervention cohort 5 times a year. When I analyze analyze this varoable at each time point separately and use GLM with family quasi-Poisson (descrete outcome and two binary variables, gender and cohort, are predictors), I observe an overdispersion. When I use GEE with R software, does GEE R package takes care only about over-dispersion regarding the repeated measure d...