[R] Letter-based representation of pairwise comparisons

hadley wickham h.wickham at gmail.com
Tue Oct 6 16:35:18 CEST 2009


Please provide a reproducible example.  I've had problems with
multcompLetters in the past, because I was giving it slightly
incorrect input.

Hadley

On Tue, Oct 6, 2009 at 7:41 AM, goz <garbage.collector at hotmail.fr> wrote:
>
> hello,
>
> i try to use the multcomp letters, but i have problems with my results :
>
> here is my pvalue matrix (from a pairwise.t.test) :
>
> pair=pairwise.t.test(...)
> pair$p.value
>
>        0           B            BxS
> B    0.01727    -             -
> BxS 0.00013    0.00226   -
> S    0.87555    0.02610   0.00027
>
>
> i was thiking to have something like that :
>  0  B  S  BxS
>  a  b  a  c
>
> but function return :
>
>> multcompLetters(pair$p.value)
>  B   BxS   S
>  "a"  "b"   "a"
>
>
> first question : why the 0 traitement doesn't appears in result ?
> second  : why the results differs than what i expected ?
>
> many thanks.
>
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