The Rq function is the rms front-end to the quantreg package's rq function. print and latex methods are also provided, and a fitting function RqFit is defined for use in bootstrapping, etc. Its result is a function definition.
For the print method, format of output is controlled by the user previously running options(prType="lang") where lang is "plain" (the default), "latex", or "html". For the latex method, html will actually be used of options(prType='html'). When using html with Quarto or RMarkdown, results='asis' need not be written in the chunk header.
1.1
Rq(formula, tau =0.5, data=environment(formula), subset, weights, na.action=na.delete, method ="br", model =FALSE, contrasts =NULL, se ="nid", hs =TRUE, x =FALSE, y =FALSE,...)## S3 method for class 'Rq'print(x, digits=4, coefs=TRUE, title,...)## S3 method for class 'Rq'latex(object, file ='', append=FALSE, which, varnames, columns=65, inline=FALSE, caption=NULL,...)## S3 method for class 'Rq'predict(object,..., kint=1, se.fit=FALSE)RqFit(fit, wallow=TRUE, passdots=FALSE)
Arguments
formula: model formula
tau: the single quantile to estimate. Unlike rq you cannot estimate more than one quantile at one model fitting.
data,subset,weights,na.action,method,model,contrasts,se,hs: see rq
x: set to TRUE to store the design matrix with the fit. For print is an Rq object.
y: set to TRUE to store the response vector with the fit
...: other arguments passed to one of the rq fitting routines. For latex.Rq these are optional arguments passed to latexrms. Ignored for print.Rq. For predict.Rq this is usually just a newdata argument.
digits: number of significant digits used in formatting results in print.Rq.
coefs: specify coefs=FALSE to suppress printing the table of model coefficients, standard errors, etc. Specify coefs=n
to print only the first n regression coefficients in the model.
title: a character string title to be passed to prModFit
object: an object created by Rq
file,append,which,varnames,columns,inline,caption: see latexrms
kint: ignored
se.fit: set to TRUE to obtain standard errors of predicted quantiles
fit: an object created by Rq
wallow: set to TRUE if weights are allowed in the current context.
passdots: set to TRUE if ... may be passed to the fitter
Returns
Rq returns a list of class "rms", "lassorq" or "scadrq", "Rq", and "rq". RqFit returns a function definition. latex.Rq returns an object of class "latex".
Author(s)
Frank Harrell
Note
The author and developer of methodology in the quantreg package is Roger Koenker.