[R] nonlinear quantile regression

[Ricardo Bessa]

Hello, I’m with a problem in using nonlinear quantile regression, the 
function nlrq.
I want to do a quantile regression o nonlinear function in the form 
a*log(x)-b, the coefficients “a” and “b” is my objective. I try to use the 
command:

funx <- function(x,a,b){
res <- a*log(x)-b
res
}

Dat.nlrq <- nlrq(y ~ funx(x, a, b), data=Dat, tau=0.25, trace=TRUE)

But a can’t solve de problem, How I put the formula “y ~ funx(x,a,b)”?

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