Hello:
That's because the required input should be a symmetric matrix with all the
comparisons, e.g., it should have the self-comparisons diagonal. In an
hypotetical case with two treatments, the pairwise-comparison test output is
something like that:
A B
B 0.80-
but multcompV
Ok, thanks for all your responses,
i was thinking, after reading the firsts messages that use only the $p.value
was good. By using a symetric matrix results are ok.
It's also good with a pvalue vector (just like exemples in the help ...).
many thanks for your help
--
View this message in c
Please provide a reproducible example. I've had problems with
multcompLetters in the past, because I was giving it slightly
incorrect input.
Hadley
On Tue, Oct 6, 2009 at 7:41 AM, goz wrote:
>
> hello,
>
> i try to use the multcomp letters, but i have problems with my results :
>
> here is my p
On Oct 6, 2009, at 8:41 AM, goz wrote:
hello,
i try to use the multcomp letters, but i have problems with my
results :
here is my pvalue matrix (from a pairwise.t.test) :
pair=pairwise.t.test(...)
pair$p.value
0 BBxS
B0.01727- -
BxS 0.000
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 BBxS
B0.01727- -
BxS 0.000130.00226 -
S0.87
I solved it. It was quite easy:
Because each test is a list, it's necessary to specify which element
contains the comparison matrix (p values). Let me show it:
>show(test)
An object of class “pairwise.htest”
$method
[1] "Wilcoxon rank sum test"
$data.name
[1] "SAND and Organ"
$p.value
Thank you! It's what I want :)
But I can't make it work. I'm working with R version 2.7.1 under Debian
GNU/Linux. Let me paste my results:
> pairwise.wilcox.test(SAND,Organ,p.adj="bonf") -> a
Pairwise comparisons using Wilcoxon rank sum test
data: SAND and Organ
FlowerA FlowerB Fl
On Thu, Jan 8, 2009 at 5:40 AM, retama wrote:
>
> Hi!
>
> I have been working several years with R but it's my first public question.
> I hope I'll be clear :) .
>
> This question is related to obtaining letter-based representation of
> non-parametric pairwise comparisons.
>
> I have a dataframe w
Hi!
I have been working several years with R but it's my first public question.
I hope I'll be clear :) .
This question is related to obtaining letter-based representation of
non-parametric pairwise comparisons.
I have a dataframe with this structure (but with quite more rows and cols):
A B C
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