samplesize (version 0.1-5)

n.wilcox.w.ties: Sample size for Wilcoxon-Mann-Whitney test with ties

Description

Function computes sample size for Wilcoxon-Mann-Whitney test adjusting for ties

Usage

n.wilcox.w.ties(beta = 0.2, alpha = 0.05, t = 0.53, p = c(0.66, 0.15, 0.19), q = c(0.61, 0.23, 0.16))

Arguments

beta

required Level II-error

alpha

required Level I-error

t

treatment fraction n/N, n is sample size of group B

p

vector of rates of group A

q

vector of rates of group B

Value

• N
  Total sample size

Details

p and q values are rates of group A and B in categories C_1,...C_D

References

Zhao YD, Rahardja D, Qu Yongming. Sample size calculation for the Wilcoxon-Mann-Whitney test adjusting for ties. Statistics in Medicine 2008; 27:462-468

See Also

n.wilcox.no.ties

Examples

n.wilcox.w.ties(beta = 0.2, alpha = 0.05, t = 0.53, p = c(0.66, 0.15, 0.19), q = c(0.61, 0.23, 0.16))