power.signrank: Compute power of the signed-rank test
Description
Use the Noether (1987) formula to compute the power of the signed-rank test, which is based on asymptotic normal approximation.
Usage
power.signrank(n, alpha, p1, p2)
Value
Vector of power estimates for two-sided tests
Arguments
n
sample size (scalar)
alpha
p-value threshold (scalar)
p1
Pr(X>0), as in Noether (JASA 1987)
p2
Pr(X+X'>0), as in Noether (JASA 1987)
Details
In most applications, the null effect size will be designated by p1 = p2 = 0.5
References
Noether, Gottfried E (1987) Sample size determination for some common nonparametric tests. Journal of the American Statistical Association, 82:645-647.