Re: [R] non linear quantile regression - Median not plotting where it should

Dan, It is hard to say without being able to reproduce your example. If you send me the data I could try to advise something. Roger url:www.econ.uiuc.edu/~rogerRoger Koenker emailrkoen...@uiuc.eduDepartment of Economics vox: 217-333-4558Unive

[R] non linear quantile regression - Median not plotting where it should

Hi, I'm attempting to calculate the 0.25 and 0.97 quantiles for tree height (0-50 meters) against tree age (0-300 years) and I am running into some difficulty with the plotted grafic. I've run the examples in the quantreg help and can get those to work properly and by plugging in my data I can

Re: [R] Non-Linear Quantile Regression

On Tue, 2008-01-01 at 15:16 +0100, Humberto Marotta wrote: > Please, > > I have a problem with nonlinear quantile regression. > > My data shows a large variability and the quantile regression seemed perfect > to relate two given variables. I got to run the linear quantile regression > analysis a

Re: [R] Non-Linear Quantile Regression

Hello, You use nlrq() pretty much the same as nls(). Look at ?nls and you will find there many examples on how to use it. The easiest way is to use with a "self-start model". Do apropos("^ss") to get the list of self-starting models defined, and look at their respective help pages to see if on

[R] Non-Linear Quantile Regression

Please, I have a problem with nonlinear quantile regression. My data shows a large variability and the quantile regression seemed perfect to relate two given variables. I got to run the linear quantile regression analysis and to build the graph in the R (with quantreg package). However, the up p