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Mean distance values (and errors) between groups of samples using vegan

Andres Mellado Diaz 
Dear list memnbers,

I would greatly appreciate any suggestion on how to get averaged  
distance values (and errors) between groups of samples using vegan  
(vegdist, dist,...).

As an example, I have a faunal table (samples by taxa, "mMCINVmmh")  
and some grouping factors (for example: "gradreg_mmh") that I want to  
test, like this:
TR_1_2    TR_1_3    TR_2_2    TR_2_3    TR_3_1    TR_3_2
TR_1_3 0.7361704
TR_2_2 0.1509007 0.7785157
TR_2_3 0.6465259 0.4095644 0.6832353
TR_3_1 0.8717468 0.9572968 0.8551546 0.9373980
TR_3_2 0.6925163 0.7197110 0.7428020 0.4742819 0.7800620
TR_3_3 0.8166542 0.7199418 0.8365397 0.6215122 0.8582932 0.5364242
[1] 0 0 3 3 5 5 5

Levels: 0 3 5
So I want to get the pairwise mean distances and errors between groups  
0, 3 and 5...


many thanks in advance,

Andr?s

-- 
Andr?s Mellado D?az

Centre for Hydrological Studies CEH-CEDEX
Water Quality Department
P? bajo de la Virgen del Puerto, 3
28005, Madrid
SPAIN

Thread (4 messages)

Andres Mellado Diaz Mean distance values (and errors) between groups of samples using vegan Dec 16 Jari Oksanen Mean distance values (and errors) between groups of samples using vegan Dec 16 Peter Solymos Mean distance values (and errors) between groups of samples using vegan Dec 16 Andres Mellado Diaz Mean distance values (and errors) between groups of samples using vegan Dec 17