epower | R Documentation |
Power is calculated for two-sample studies. Can be vectorized, but w
, lam
, cens
, must always be length 2.
epower(n, r, alpha = 0.05, w = c(1, 1), n1, n2, lam, cens)
esamsize(r, w = c(1, 1), alpha = 0.05, power = 0.8, lam, cens)
n |
Total sample size. |
r |
Effect size (ratio of hazards/medians). |
alpha |
Type I error rate. |
w |
Controls sample size balance between two groups. Default: Equal size groups. |
n1 , n2 |
Sample size in each group. |
lam |
Hazard rate in each group (if specified, overrides |
cens |
Censoring rate. |
power |
Desired power. Default: 0.8. |
epower(30, 2)
epower(30, lam=c(2,1), cens=c(0.2, 0.5))
epower(seq(30, 100, 10), lam=c(2,1), cens=c(0.2, 0.5))
epower(seq(30, 100, 10), w=c(2,1), lam=c(2,1), cens=c(0.2, 0.5))
epower(30, seq(1.5, 2.5, 0.1))
epower(30, 2, alpha=c(0.01, 0.05, 0.1))
esamsize(1.5)
esamsize(lam=c(1.5, 1), cens=1)
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