Hi I was fitting this model with two matrices. But this bifit function didnt run in my R studio and i got error message. Could anyone guide me how to install this command. I am giving that command below to have better understanding. x.f <- cbind(log(Q5.all.pf), log(Q5.all.pf)^2) y.f <- t(log(mx5x5.all.pf)) bifit.f <- bifit(x.f, y.f, c=6) Ankita Shukla Research Scholar International Institute for Population sciences Mumbai, India [[alternative HTML version deleted]]