pwepowerfindt: Calculating the timepoint where a certain power of the...

Description Usage Arguments Details Value Note Author(s) References See Also Examples

Description

This will calculate the timepoint where a certain power of the specified test statistics is obtained accouting for staggered entry, delayed treatment effect, treatment crossover and loss to follow-up.

Usage

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pwepowerfindt(power=0.9,alpha=0.05,twosided=1,tupp=5,tlow=1,taur=1.2,
                     u=c(1/taur,1/taur),ut=c(taur/2,taur),pi1=0.5,
                     rate11=c(1,0.5),rate21=rate11,rate31=c(0.7,0.4),
                     rate41=rate21,rate51=rate21,ratec1=c(0.5,0.6),
                     rate10=rate11,rate20=rate10,rate30=rate31,
                     rate40=rate20,rate50=rate20,ratec0=c(0.6,0.5),
                     tchange=c(0,1),type1=1,type0=1,
                     rp21=0.5,rp20=0.5,eps=1.0e-2,veps=1.0e-2,
                     epsbeta=1.0e-04,iterbeta=25,
                     n=1000,testtype=1,maxiter=20,itereps=0.001)

Arguments

power

the desired power

alpha

type-1 error

twosided

twoside test or not

tupp

an upper time point where the power should be larger than power

tlow

a lower time point where the power should be smaller than power

taur

recruitment time

u

Piecewise constant recuitment rate

ut

Recruitment intervals

pi1

Allocation probability for the treatment group

rate11

Hazard before crossover for the treatment group

rate21

Hazard after crossover for the treatment group

rate31

Hazard for time to crossover for the treatment group

rate41

Hazard after crossover for the treatment group for complex case

rate51

Hazard after crossover for the treatment group for complex case

ratec1

Hazard for time to censoring for the treatment group

rate10

Hazard before crossover for the control group

rate20

Hazard after crossover for the control group

rate30

Hazard for time to crossover for the control group

rate40

Hazard after crossover for the control group for complex case

rate50

Hazard after crossover for the control group for complex case

ratec0

Hazard for time to censoring for the control group

tchange

A strictly increasing sequence of time points at which the event rates changes. The first element of tchange must be zero. It must have the same length as rate11, rate21, rate31, etc.

type1

Type of crossover in the treatment group

type0

Type of crossover in the control group

rp21

re-randomization prob in the treatment group

rp20

re-randomization prob in the control group

eps

error tolerence

veps

error tolenrence for calculating variance

epsbeta

error tolerance for calculating overall log HR

iterbeta

maximum number of iterations for calculating overall log HR

n

total number of subjects

testtype

test statistics, =1 log-rank;=2 Cox model; =3 log-rank with robust variance

maxiter

maximum number of bi-section iterations

itereps

error tolerance of power

Details

The hazard functions corresponding to rate11,...,rate51,ratec1, rate10,...,rate50,ratec0 are all piecewise constant function taking the form λ(t)=∑_{j=1}^m λ_j I(t_{j-1}≤ t<t_j), where λ_1,…,λ_m are the corresponding elements of the rates and t_0,…,t_{m-1} are the corresponding elements of tchange, t_m=∞. Note that all the rates must have the same tchange.

Value

testtype

type of statistic, =1 log-rank;=2 Cox model; =3 log-rank with robust variance

time

time calculated when the iterations stop

power

the power at time

err

distance from the desired power

k

number of bi-section iterations performed

Note

Version 1.0 (7/19/2016)

Author(s)

Xiaodong Luo

References

Luo, et al. (2017)

See Also

pwe,rpwe,qpwe,ovbeta,innervar

Examples

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t<-seq(3,6,by=1)
taur<-1.2
u<-c(1/taur,1/taur)
ut<-c(taur/2,taur)
r11<-c(0.2,0.1)
r21<-r11
r31<-c(0.03,0.02)
r41<-r51<-r21
rc1<-c(0.01,0.02)
r10<-c(0.2,0.2)
r20<-r10
r30<-c(0.02,0.01)
r40<-r50<-r20
rc0<-c(0.02,0.01)
getpower<-pwepower(t=t,alpha=0.05,twosided=1,taur=taur,u=u,ut=ut,pi1=0.5,
                   rate11=r11,rate21=r21,rate31=r31,rate41=r41,rate51=r51,ratec1=rc1,
                   rate10=r10,rate20=r20,rate30=r30,rate40=r40,rate50=r50,ratec0=rc0,
                   tchange=c(0,1),type1=1,type0=1,n=1000)
###powers at each time point
cbind(t,getpower$power[,1:3])

###90% power should be in (3,3.5)
getpwtime<-pwepowerfindt(power=0.9,alpha=0.05,twosided=1,tupp=3.5,tlow=3,taur=taur,
        u=u,ut=ut,pi1=0.5,rate11=r11,rate21=r21,rate31=r31,rate41=r41,rate51=r51,ratec1=rc1,
        rate10=r10,rate20=r20,rate30=r30,rate40=r40,rate50=r50,ratec0=rc0,
        tchange=c(0,1),type1=1,type0=1,n=1000,testtype=1,maxiter=30)
getpwtime

PWEALL documentation built on May 2, 2019, 4:16 a.m.

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