pwu: Piecewise uniform distribution: distribution

In PWEALL: Design and Monitoring of Survival Trials Accounting for Complex Situations

Piecewise uniform distribution: distribution

Description

This will calculate the distribution function of the piecewise uniform distribution

Usage

pwu(t=seq(0,1,by=0.1),u=c(0,5,0.5),ut=c(1,2))

Arguments

t	a vector of time points
u	piecewise constant density
ut	a strictly increasing sequence of time points defining the pieces. The first element must be strictly greater than zero. u and ut must have the same length.

Details

Let f(t)=\sum_{j=1}^m u_j I(t_{j-1}<t\le t_j) be the density function, where u_1,\ldots,u_m are the corresponding elements of u and t_1,\ldots,t_{m} are the corresponding elements of ut and t_0=0. The distribution function

F(t)=\sum_{j=1}^m u_j(t\wedge t_j-t\wedge t_{j-1}).

User must make sure that \sum_{j=1}^m u_j (t_j-t_{j-1})=1 before using this function.

Value

dist	distribution

Note

This provides distribution of the piecewise uniform distribution

Author(s)

Xiaodong Luo

References

Luo, et al. (2017)

See Also

pwe

Examples

t<-seq(-1,3,by=0.5)
u<-c(0.6,0.4)
ut<-c(1,2)
pwud<-pwu(t=t,u=u,ut=ut)
pwud

PWEALL documentation built on Aug. 9, 2023, 9:08 a.m.