[R-sig-eco] cca

[Zoltan Botta-Dukat]

Dear Mahnaz,

Maybe the sum of sand+gravel+silt is always 1 or 100%. There are only 3 
canonical axes suggesting that you have only 3 independent environmental 
variables.
cca may handle such cases by this way.

Best wishes

Zoltan


2014.08.03. 17:24 keltezéssel, Mahnaz Rabbaniha írta:
> Dear all
>
> I have done cca in vegan pakage;
>
> two text file are included:
> *bio*
>   [1] "Ampharetidae" "Sponoidae"    "Naeidae"      "Balanidae"
>   "Gammaridae"
> [6] "Cyprididae"   "Cardidae"     "Dreissenidae" "Semelidae"
>
>   *mo*
>   "sand"      "gravel"    "silt" "TOM"
>
>
> vare.cca <- cca(bio,mo)
> summary(vare.cca)
>
> Biplot scores for constraining variables
>
>            CCA1    CCA2    CCA3 CA1 CA2 CA3
> sand   0.08356 -0.4027 -0.9111   0   0   0
> gravel 0.15836  0.8716 -0.4676   0   0   0
> TOM    0.63367 -0.6390  0.4239   0   0   0
>
> *silt is not in the summary part??/*
>
> Please inform me what is problem
>
>
> all the best


-- 
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.zoltan at 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.zoltan at okologia.mta.hu
www.okologia.mta.hu