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
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
Web: http://www.erasmusmc.nl/biostatistiek/
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