int_info: Create start/end times and interval information

In adibender/pamm: Functions and Utilities for fitting Piece-wise Exponential (Additive) models

Description

Given interval breaks points, returns data frame with information on interval start time, interval end time, interval length and a interval factor variable (left open intervals). If object of class ped is provided, extracts unique interval information from object.

Usage

int_info(x, ...)

## Default S3 method:
int_info(x, min.time = 0L, ...)

## S3 method for class 'ped'
int_info(x, ...)

## S3 method for class 'pamm'
int_info(x, ...)

Arguments

x	A numeric vector of cut points in which the follow-up should be partitioned in or object of class ped.
...	Currently ignored.
min.time	Only intervals that have lower borders larger than this value will be included in the resulting data frame.

Value

A data frame containing the start and end times of the intervals specified by the x argument. Additionally the interval length, interval mid-point and a factor variable of the intervals themselves.

See Also

split_data ped_info

Examples

## create interval information from cut points
int_info(c(1, 2.3, 5))

## extract interval information used to create ped object
tdf <- data.frame(time=c(1, 2.3, 5), status=c(0, 1, 0))
ped <- split_data(Surv(time, status)~., data=tdf, id="id", max.end=TRUE)
int_info(ped)

## extract interval information of ped that was used to fit the model
data("veteran", package="survival")
vet_ped <- split_data(Surv(time, status)~age, data=veteran, cut=seq(0, 500, by=100))
vet_pam <- pamm(ped_status ~ s(tend, k=3), data=vet_ped)
int_info(vet_pam)

adibender/pamm documentation built on May 14, 2019, 5:22 p.m.