[R] Letters group Games-Howell post hoc in R

Meyners, Michael meyners.m at pg.com
Thu Jan 18 13:29:57 CET 2018

Apologies if I missed any earlier replies - did you check
multcompLetters in package {multcompView}?
It allows you to get connecting letters reports (if that's what you are after, I didn't check what exactly agricolae is providing here). May have to add some manual steps to combine this with any data (means or whatever) you want to report.
multcompLetters allows you to use p values or a logical (significant or not)
HTH, Michael

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of David Bars
> Cortina
> Sent: Dienstag, 16. Januar 2018 13:51
> To: R-help at r-project.org
> Subject: [R] Letters group Games-Howell post hoc in R
> Hello everybody,
> I use the sweetpotato database included in R package:
> data(sweetpotato) This dataset contains two variables: yield(continous
> variable) and virus(factor variable).
> Due to Levene test is significant I cannot assume homogeneity of variances
> and I apply Welch test in R instead of one-way ANOVA followed by Tukey
> posthoc.
> Nevertheless, the problems come from when I apply posthoc test. In Tukey
> posthoc test I use library(agricolae) and displays me the superscript letters
> between virus groups. Therefore there are no problems.
> Nevertheless, to perform Games-Howell posthoc, I use
> library(userfriendlyscience) and I obtain Games-Howell output but it's
> impossible for me to obtain a letter superscript comparison between virus
> groups as it is obtained through library(agricolae).
> The code used it was the following:
> library(userfriendlyscience)
> data(sweetpotato)
> oneway<-oneway(sweetpotato$virus, y=sweetpotato$yield, posthoc =
> 'games-howell')
> oneway
> I try with cld() importing previously library(multcompView) but doesn't work.
> Can somebody could helps me?
> Thanks in advance,
> David Bars.
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