Poisson Regression
Fitting the Model
glm( Y ~ X , data = , family = "poisson" )
Quasi-Poisson Regression
glm( Y ~ X , data = , family = "quasipoisson" )
Checking for Overdisperion
suppressMessages(library(AER))
dispersiontest(model)
Including Offsets
glm( Y ~ X , offset = log( offsetvariable ) , data = )