Wilcoxon z statistic

Calculates the z statistic for a Wilcoxon two-sample, paired, or one-sample test.

Usage

wilcoxonZ(
  x,
  y = NULL,
  mu = 0,
  paired = FALSE,
  exact = FALSE,
  correct = FALSE,
  digits = 3
)

Arguments

x

A vector of observations.

y

For the two-sample and paired cases, a second vector of observations.

mu

For the one-sample case, the value to compare x to, as in wilcox.test

paired

As used in wilcox.test.

exact

As used in wilcox.test, default here is FALSE.

correct

As used in wilcox.test, default here is FALSE.

digits

The number of significant digits in the output.

Value

A single statistic, z.

Details

This function uses code from wilcox.test, and reports the z statistic, which is calculated by the original function but isn't returned.

The returned value will be NA if the function attempts an exact test.

For the paired case, the observations in x and and y should be ordered such that the first observation in x is paired with the first observation in y, and so on.

Author

Salvatore Mangiafico, mangiafico@njaes.rutgers.edu, R Core Team

Examples

data(Pooh)
wilcoxonZ(x = Pooh$Likert[Pooh$Time==1], y = Pooh$Likert[Pooh$Time==2],
          paired=TRUE, exact=FALSE, correct=FALSE)
#>     z 
#> -2.33