program burr7burr7 version 13.0 args lnf Xb Xd tempvar sigma tempvar mu quietly { gen double `sigma' = exp(`Xd') gen double `mu' = `Xb' replace `lnf' = 2*log(cosh((`mu' + atanh(1 - 2*$ML_y1))/`sigma')^(-1)) /// - log(4*`sigma'*$ML_y1 - 4*`sigma'*$ML_y1^2) } end /* This distribution is from the CDF-quantile family presented in Smithson, M. & Shou, Y. (2017). CDF-quantile distributions for modeling random variables on the unit interval. British Journal of Mathematical and Statistical Psychology, 70(3), 412-438. */