Cox.NIS | R Documentation |
b is the log hazard ratio for treatment, \delta
is the margin
H0: b \le \delta
Ha: b > \delta
Cox.NIS(alpha, beta, loghr, p1, d, delta)
alpha |
significance level |
beta |
power = 1-beta |
loghr |
log hazard ratio=log(lamda2/lamda1)=b |
p1 |
the proportion of patients in treatment 1 group |
d |
the probability of observing an event |
delta |
margin is the true difference of log hazard rates between control group lamda1 and a test drug group lamda2 |
Chow SC, Shao J, Wang H. Sample Size Calculation in Clinical Research. New York: Marcel Dekker, 2003
Example.7.3.4<-Cox.NIS(0.05,0.2,log(2),0.5,0.8,0.5)
Example.7.3.4
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