Skip to contents

Helper functions to test proportion differences

Source: R/prop_diff_test.R
h_prop_diff_test.Rd

Helper functions to implement various tests on the difference between two proportions.

Usage 

prop_chisq(tbl, alternative = c("two.sided", "less", "greater"))

prop_cmh(
  ary,
  alternative = c("two.sided", "less", "greater"),
  transform = c("none", "wilson_hilferty")
)

prop_schouten(tbl, alternative = c("two.sided", "less", "greater"))

prop_fisher(tbl, alternative = c("two.sided", "less", "greater"))

Arguments

tbl

(matrix)
matrix with two groups in rows and the binary response (TRUE/FALSE) in columns.

alternative

(string)
whether two.sided, or one-sided less or greater p-value should be displayed.

ary

(array, 3 dimensions)
array with two groups in rows, the binary response (TRUE/FALSE) in columns, and the strata in the third dimension.

transform

(string)
either none or wilson_hilferty; specifies whether to apply the Wilson-Hilferty transformation of the chi-squared statistic.

Value

A p-value.

Functions

  • prop_chisq(): Performs Chi-Squared test. Internally calls stats::prop.test().

  • prop_cmh(): Performs stratified Cochran-Mantel-Haenszel test, using stats::mantelhaen.test() internally. Note that strata with less than two observations are automatically discarded.

  • prop_schouten(): Performs the Chi-Squared test with Schouten correction.

  • prop_fisher(): Performs the Fisher's exact test. Internally calls stats::fisher.test().

See also

prop_diff_test() for implementation of these helper functions.

Schouten correction is based upon Schouten et al. (1980) .