signedrank: Power calculation for signed-rank test

In powertools: Power and Sample Size Tools

Power calculation for signed-rank test

Description

The signed-rank test is a nonparametric alternative to a one-sample or paired t test. This function performs power and sample size calculations for the signed-rank test using Noether's approximation; see Noether (1987) Sample size determination for some common nonparametric tests. JASA 82(398):645-647.

Usage

signedrank(
  N = NULL,
  ps = NULL,
  alpha = 0.05,
  power = NULL,
  sides = 2,
  v = FALSE
)

Arguments

N	The sample size; number of observations or paired differences.
ps	The probability that the sum of two values exceeds zero when the alternative hypothesis is true.
alpha	The significance level or type 1 error rate; defaults to 0.05.
power	The specified level of power.
sides	Either 1 or 2 (default) to specify a one- or two-sided hypothesis test.
v	Either TRUE for verbose output or FALSE to output computed argument only.

Details

Due to symmetry, the power for p is equal to the power for 1 - p. Therefore, when solving for p, two values, p and 1 - p, are returned.

Value

A list of the arguments (including the computed one).

Examples

signedrank(N = 20, ps = 0.87, power = NULL, sides = 2)

powertools documentation built on April 4, 2025, 5:02 a.m.