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regressionpoisson

statement exposure in poisson regression using R

I am trying to fit the model from Frome(1983) in R using poisson Regression, but i dont know how add the exposure: ln(person-years), the model is:

ln E(Y|X)= ln(person-years)+ B0+ B1X1+ B2X2.

Do you know how fit that ?

Solution

  • You can perform poisson regression analysis using the below R code.

    m1<- glm(y ~ offset(log(person-years))+X1+X2, family="poisson", data=dat) summary(m1)

    Because you use an offset of 'log(person-years)', the coefficient of 'log(person-years)' is forced to be 1.