R: Extract residuals from a grpreg or grpsurv fit

residuals.grpreg {grpreg} | R Documentation

## Extract residuals from a grpreg or grpsurv fit

### Description

Currently, only deviance residuals are supported.

### Usage

    ## S3 method for class 'grpreg'
    residuals(object, lambda, which = 1:length(object$lambda), drop = TRUE, ...)

### Arguments

`object` | Object of class `grpreg` or `grpsurv`.
`lambda` | Values of the regularization parameter at which residuals are requested (numeric vector). For values of lambda not in the sequence of fitted models, linear interpolation is used.
`which` | Index of the penalty parameter at which residuals are requested (default = all indices). If `lambda` is specified, this take precedence over `which`.
`drop` | By default, if a single value of lambda is supplied, a vector of residuals is returned (logical; default=`TRUE`). Set `drop=FALSE` if you wish to have the function always return a matrix (see `drop()`).
`...` | Not used.

### Examples

    data(Birthwt)
    X <- Birthwt$X
    y <- Birthwt$bwt
    group <- Birthwt$group
    fit <- grpreg(X, y, group, returnX=TRUE)
    residuals(fit)[1:5, 1:5]
    head(residuals(fit, lambda=0.1))

[Package grpreg version 3.4.0 Index]