[R] assign group letters to T/F matrix

[Dimitris Rizopoulos]

Have a look at package multcomp at: 
http://cran.r-project.org/package=multcomp


I hope it helps.

Best,
Dimitris


On 8/31/2011 2:30 PM, eldor ado wrote:
> dear R community,
>
> i appologize as this is kind of a newbie question, but:
>
> I want to assign group letters (like in anova post-hoc tests) to data
> with combined means and SDs. It's easy to apply t-test formulas to get
> a materix like
>
> (A - D are treatments
>
>    |  A   B   C   D
> -----------------------
> A|       T    F   F
> B|             T   F
> C|                  F
> D|
>
> where true stands for sign. differences/ F for no sign. differences.
> is there an alogarithm that converts such a matrix to letters to be
> assignedto A, B, C,... ? and does maybe somebody know a packages that
> runs t-tests on means+SD+n data?
>
> lukas kohl
>
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

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