search for: fitnl

Dear all, I sent an email on Friday asking about nlrq {quantreg}, but I haven't received any answer. I need to estimate the quantile regression estimators of a model as: y = exp(b0+x'b1+u). The model is nonlinear in parameters, although I can linearise it by using log.When I write: fitnl <- nlrq(y ~ exp(x), tau=0.5) I have the following error: Error in match.call(func, call = cll) : invalid 'definition' argument Is there any way to estimate this model, or should I accept the following change: fitnl <- rq(log(y) ~ x, tau=0.5) ? Thanks in advance! Best, Julia...