coxed (version 0.3.3)

censor.x: Generate right-censoring to be dependent on the data

Description

This function is called by sim.survdata and is not intended to be used by itself.

Usage

censor.x(x, censor = 0.1)

Arguments

x

A matrix or data frame containing covariates

censor

The proportion of observations to designate as being right-censored

Value

A vector of logical values

Details

The purpose of this function is to efficiently generate indicators for whether or not an observation in simulated duration data is right-censored. In this case, whether or not an observation is right-censored depends on the covariates in the data.

This function randomly draws new coefficients, one for every column of x, from the normal distribution with mean 0 and standard deviation of 0.1. It uses these new coefficients to build a linear predictor, to which is added a disturbance term which is also drawn from N(0,.1). A fixed proportion, given by censor, of the observations with the highest values of this linear predictor are set to be TRUE and the others are set to FALSE.

See Also

sim.survdata

Examples

# NOT RUN {
Xdata <- matrix(rnorm(300), 100, 3)
censor.x(Xdata, .1)
# }