posthocTGH

This function is used by the 'oneway' function for oneway analysis of variance in case a user requests post-hoc tests using the Tukey or Games-Howell methods.

Keywords
utilities
Usage
posthocTGH(y, x, method=c("games-howell", "tukey"),
           conf.level = 0.95, digits=2, p.adjust="holm",
           formatPvalue = TRUE)
Arguments
y
y has to be a numeric vector.
x
x has to be vector that either is a factor or can be converted into one.
method
Which post-hoc tests to conduct. Valid values are "tukey" and "games-howell".
conf.level
Confidence level of the confidence intervals.
digits
The number of digits to show in the output.
p.adjust
Any valid p.adjust method.
formatPvalue
Whether to format the p values according to APA standards (i.e. replace all values lower than .001 with '<.001'). This only applies to the printing of the object, not to the way the p values are stored in the object.
Value

A list of three elements:

input
List with input arguments
intermediate
List of intermediate objects.
output
List with two objects 'tukey' and 'games.howell', containing the outcomes for the respective post-hoc tests.

Note

This function is based on a file that was once hosted at http://www.psych.yorku.ca/cribbie/6130/games_howell.R, but has been removed since. It was then adjusted for implementation in the userfriendlyscience package. Jeffrey Baggett needed the confidence intervals, and so emailed them, after which his updated functions was used. In the meantime, it appears Aaron Schlegel (https://rpubs.com/aaronsc32) independently developed a version with confidence intervals and posted it on RPubs at https://rpubs.com/aaronsc32/games-howell-test.

Aliases
  • posthocTGH
Examples
### Compute post-hoc statistics using the tukey method
posthocTGH(y=ChickWeight$weight, x=ChickWeight$Diet, method="tukey");
### Compute post-hoc statistics using the games-howell method
posthocTGH(y=ChickWeight$weight, x=ChickWeight$Diet);
Documentation reproduced from package userfriendlyscience, version 0.6-1, License: GPL (>= 2)

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