hi zoltan
do you have another idea to calculate the dispersion?
thanks
Am 30.07.2015 07:52 schrieb Zoltan Botta-Dukat:
Hi Natalie,
Be careful with convex hull volume, because it is zero if points lie
on a line (an near to zero, if the configuration is close to this),
independently from the amount of distances.
Zoltan
2015.07.29. 19:26 keltezéssel, Natalie írta:
hi all
I would like to calculate a dispersion index or similar from the
results of the vegan function betadisper.
i would like to know if there is a possibility to e.g. calculate the
volume of the community dispersion(area of the hull in the PCoA) from
the betadisper results.
common is to show the distance to the centroid.but I have the
impression the dispersion within communities are not that
clear,especially if you have similar variance.
The program primer v5 calculates a disperion index based on the
similarity percentage.
similarity percentage is not an option since it is mainly based on
most counted species.
ideas and help are very much appreciated
cheers natalie
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Botta-Dukát Zoltán
--------------------------------
Ökológiai és Botanikai Intézet
Magyar Tudományos Akadémia
Ökológiai Kutatóközpont
--------------------------------
2163. Vácrátót, Alkotmány u. 2-4.
tel: +36 28 360122/157
fax: +36 28 360110
botta-dukat.zol...@okologia.mta.hu
www.okologia.mta.hu
Zoltán BOTTA-Dukát
--------------------------------
Institute of Ecology and Botany
Hungarian Academy of Sciences
Centre for Ecological Research
--------------------------------
H-2163 Vácrátót, Alkomány u. 2-4.
HUNGARY
Phone: +36 28 360122/157
Fax..: +36 28 360110
botta-dukat.zol...@okologia.mta.hu
www.okologia.mta.hu
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