[R] Quantile regression interval prediction

Hi all,I would like to know how to predict a new y value and its confidence interval for the prediction given a new observation x when using a linear(or non-linear) quantile regression model.How it is possible to transform the confidence prediction in to an interval prediction? Is it correct to

Re: [R] mvpart error in R 3.1.1 s_to_rp not available for .C()

15:03, Angel Marley wrote: Dear R list, I'm working with recursive tress using packages mvpart and rpart in R in linux xubuntu (64). The package performed with no problem under my previous R version (2.14) I had recently updated my R version to 3.1.1 and when I try to run a mvpart model I

[R] mvpart error in R 3.1.1 s_to_rp not available for .C()

Dear R list, I'm working with recursive tress using packages mvpart and rpart in R in linux xubuntu (64). The package performed with no problem under my previous R version (2.14) I had recently updated my R version to 3.1.1 and when I try to run a mvpart model I get the following error

[R] AIC for piecewise and cuadratic comparison

Hi everybody, I would like to compare using the Akaike Information Criteria (AIC) a quadratic model and a piecewise fitted model. Is it correct to use AIC to compare this models with such a different structure? Thanks in advance Angel # A simple example a-1 b-2 xx-seq(-15,15,length=50) #

[R] R extract vertices for polygon

Dear R users, I'm trying to extract from a given matrix (GROUP) the coordinates of the vertices of the different groups (i.e. 3, 7, 1 . . .) to plot the polygons to delineate the area in which each group wins and colour it diferentially. I can make a simple point plot, but I would like to add

[R] misalignement of secondary axis in multhist

Hi everybody, I'm trying a multiple histogram, and I'd like to add on it a secondary axis with a line (cumulative frequencies, or wathever lines), and the 0 intercept doesnt coincide in y1 and y2, which dificult interpretation and makes presentation not nice. I had seen some related answer for

[R] how to save many trees within a loop?

Hi, I would like to save many trees created in a loop as different ones. I can plot them, but I can not get the whole tree properties saved. I paste the script below Also, How can I perform multivariate trees?, that is predicting a vector o values, not a simple scalar observation. Thanks in