[R-sig-eco] Mean distance values (and errors) between groups of samples using vegan

[Jari Oksanen]

Function meandist() should do this. Its name is kind of hint.

Cheers, Jari Oksanen
On 16/12/2013, at 21:16 PM, Andres Mellado Diaz wrote:

> 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:
> 
> 
>> vegdist(mMCINVmmh, method="bray", binary=FALSE, diag=F, upper=F)->vegdist1
> 
>> vegdist1
> 
>          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
> 
>> gradreg_mmh
> 
> [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,
> 
> Andrés
> 
> -- 
> Andrés Mellado Díaz
> 
> Centre for Hydrological Studies CEH-CEDEX
> Water Quality Department
> Pº bajo de la Virgen del Puerto, 3
> 28005, Madrid
> SPAIN
> 
> 
> -- 
> Andrés Mellado Díaz
> 
> Centre for Hydrological Studies CEH-CEDEX
> Water Quality Department
> Pº bajo de la Virgen del Puerto, 3
> 28005, Madrid
> SPAIN
> 
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