bootbiascorrect {CPsurv}  R Documentation 
Implements Bootstrap Bias Correction
bootbiascorrect(changeP, time, event, censoring, censpoint, intwd, cpmax, cpmin, norm.riskset, B.correct, parametric, times.int, opt.start)
changeP 
Estimated change point. 
time 
Numeric vector with survival times. 
event 
Numeric vector indicating censoring status; 0 = alive (censored), 1 = dead (uncensored). If missing, all observations are assumed to be uncensored. 
censoring 
Type of rightcensoring for simulated data on which the bootstrap bias correction is based. Possible types are "random" for random censoring (default), "type1" for Type I censoring or "no" for data without censored observations. Because simulated data should be similar to given data, the censoring type is adapted from vector 'events' if given and argument 'censoring' is ignored than. 
censpoint 
Point of Type I censoring; if missing, minimum time after which all events are equal to 0 is used. Censpoint is only needed for bootstrap bias correction. 
intwd 
Width of intervals into which the time period is split; default
is 
cpmax 
Upper bound for estimated change point. Time period is split into intervals up to this point. Has to be an integer value. 
cpmin 
Lower bound for estimated change point; default is

norm.riskset 
Logical; if 
B.correct 
Number of bootstrap samples for bias correction; defaults to 49. 
parametric 
Logical; if 
times.int 
Logical; if 
opt.start 
Numeric vector of length two; initial values for the Weibull parameters (shape and scale parameters) to be optimized if parametric bootstrap bias correction is used. 
A list with biascorrected change point and optional estimated shape and scale parameters of the Weibull distribution.