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I am looking into race and homicides in the USA, 1995-2016. I want to look into "trans-race" (victim and perpetrator different races) homicides by race and year. However I want to also include effects of different racial frequencies within the population. Since it's count data, I was presuming to us a poisson family.

It's almost as if I am looking at a "double offset", where I offset the (log) count of "trans-race" murders by (log) total murder victims of that race, but how do I account for differences in overall frequencies of each racer?

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After much searching, I finally was able to create an incantation that let me find the answer already on this site:

Is it possible to use two offsets?

In short, multiply all the offsets together within the offset(log(foo))) element.

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