joineRML (version 0.1.1)

sampleData: Sample from an mjoint object

Description

Generic function used to sample a subset of data from an object of class mjoint, with a specific size of number of subjects.

Usage

sampleData(object, size = NULL)

Arguments

object

an object inheriting from class mjoint for a joint model of time-to-event and multivariate longitudinal data.

size

number of subjects to include in the sampled subset. If size=NULL (default), then size is set equal to the number of subjects used to fit the mjoint model.

Value

A list of 2 data.frames: one recording the requisite longitudinal outcomes data, and the other recording the time-to-event data.

Details

This function is primarily intended for internal use in the bootSE function in order to permit bootstrapping. However, it can be used for other purposes given a fitted mjoint object.

See Also

mjoint.

Examples

## Not run: 
# # Fit a joint model with bivariate longitudinal outcomes
# 
# data(heart.valve)
# hvd <- heart.valve[!is.na(heart.valve$log.grad) & !is.na(heart.valve$log.lvmi), ]
# 
# fit2 <- mjoint(
#     formLongFixed = list("grad" = log.grad ~ time + sex + hs,
#                          "lvmi" = log.lvmi ~ time + sex),
#     formLongRandom = list("grad" = ~ 1 | num,
#                           "lvmi" = ~ time | num),
#     formSurv = Surv(fuyrs, status) ~ age,
#     data = list(hvd, hvd),
#     inits = list("gamma" = c(0.11, 1.51, 0.80)),
#     timeVar = "time",
#     verbose = TRUE)
# sampleData(fit2, size = 10)
# ## End(Not run)