Get the p-value from a u-test

Performs a non-parametric test by assigning ranks to individual observations in the samples. Tests the median differences between the compared samples. Returns the p-value from a u-test with useful default parameters. Returns NA if the u-test is uncalculable (i.e. does try() handling).

Usage

get.utest.p(x, group1, group2, paired = FALSE, alternative = 'two.sided');

Arguments

x

Vector of numbers to analyze

group1

Vector of TRUE/FALSE indicating which are the x samples for the u-test

group2

Vector of TRUE/FALSE indicating which are the y samples for the u-test

paired

Do a paired u-test?

alternative

What's the null-hypothesis?

Details

If group2 = NULL, or if both group1 and group2 are given and paired is TRUE, the Wilcoxon signed rank test will be performed. If both group1 and group2 are given, the Wilcoxon rank sum test will be performed.

Value

returns the p value from u-test between the mean of group1 and group2

Author

Cindy Q. Yao

See also

get.utest.p.and.medianfoldchange

Examples

get.utest.p(
  x = rnorm(100),
  group1 = c(rep(TRUE, 50), rep(FALSE, 50)),
  group2 = c(rep(FALSE, 50), rep(TRUE, 50)),
  paired = FALSE,
  alternative = 'two.sided'
  );
#> [1] 0.3259179