# Since incidence rate ratios are always positive, how does one determine the sign of the effect?

I want the results from a Poisson regression to be comparable to previous OLS and Tobit regressions. To do this, I am utilizing the irr (incidence rate ratio) option in Stata. However, since all the estimated coefficients are being exponentiated, all irr coefficients are positive. Given that, how does one determine the sign of each estimated coefficient? Would it be kosher to just assume that the negative or positive sign from running the same Poisson estimation without the irr option is still applicable?

So if you want to know the "sign" of an incidence risk ratio you look at whether it is larger or smaller than 1. This is equivalent to looking at whether the raw coefficients are larger or smaller than 0 ($\exp(0)=1$).