Thank you very much Brian.

Best,

Manuel

On 28/03/2011 06:07 a.m., Brian Inouye wrote:
> There are other dissimilarity metrics that could also be used, each 
> with different assumptions of course.
> Raup-Crick is a reasonable choice of distance metric, but I'm not sure 
> if the current version of vegdist() has been updated to reflect 
> discussion in Chase et al 2011 in Ecosphere 
> (http://www.esajournals.org/doi/abs/10.1890/ES10-00117.1).
>
> -Brian
>
> On 3/28/2011 12:00 PM,"Manuel Spínola"<mspinola10@gmail.com>  wrote:
>> Is the Raup--Crick dissimilarity metric the only option for a
>> presence/absence data in "vegdist" or using binary = T could I use any
>> other dissimilarity metric?
>>
>> Best,
>>
>> Manuel
>> <snip>
>> On 27/03/2011 09:07 a.m., Jari Oksanen wrote:
>>> Manuel,
>>>
>>> As I read it, the error message comes from isoMDS() that does not 
>>> accept
>>> zero distances, and you have decided to ignore this (by setting 
>>> zerodist =
>>> "ignore"). Either you or isoMDS must give up, and I think it is 
>>> easier for
>>> you: try setting 'zerodist = "add"', and confess that isoMDS() wins 
>>> your
>>> dispute.
>>>
>>> Another message you got is from vegdist() which only tells you that 
>>> empty
>>> species (= that do not occur in your data) will influence your data. 
>>> That is
>>> only informational, and not an error.
>>>
>>> Cheers, Jari Oksanen
>
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>
>


-- 
*Manuel Spínola, Ph.D.*
Instituto Internacional en Conservación y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
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mspinola10@gmail.com
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