I want to estimate different slopes and intercepts for the three groups. For example: group A is subjects whose father's were blue-collar; group B is subjects whose father's were white-collar; group C is subjects whose father's were other types of workers. I have repeated measures for 10 annual surveys and subjects reported how much of their income they saved. I want to see if the intercept and trajectory differs for the three groups.

This is what I come up with but I am not sure if this gets at the appropriate verbal explanation. Thank you very much for your time. I truly appreciate it. Thank you!

m1 = xtmixed savings time || subjects:, var m1 looks at the impact of time on savings and estimates intercepts and slopes for each subject.

m2 = xtmixed savings time##fathers_occupation || subjects:, var Does m2 examine the differences in the intercept and slope for the two groups? Or do i need to add fathers_occupation to the right side of || as well? ]]>

I am not sure how to calculate age-adjusted incidence rates using poisson regression. I am comparing injuries for children at two schools, offset by child-days in school and would like to adjust for age. I ran the following model:

poisson injuries school i.age, offset(childdays)

I am able to determine age specific incidence rates and an age adjusted incidence rate ratio but don't know how to calculate an age adjusted incidence rate for the two schools.

Thanks!

Hannah ]]>