[R-sig-eco] Dissimilarity ranking

[zhangjl]

Dear Yong Zhang
    If you have a "standard" community matrix as the following, you may try to use the function vegdist() in package vegan, to calculate the dissimilarity matrix between each pair of the "sites"
    The matrix is something like:
          sp1 sp2 sp3 sp4 sp5 sp6 sp7
  plot1   3   6   1   2   1   0   0
  plot2   8   0  30   0   0   0   0
  plot3   0   1   0   2   0   1   3

see ?vegdist for more information.
In addition, you can use package spaa, to convert the raw data to "standard" community matrix.
   Cheers,
   Jinlong

2010-12-10 

Jinlong Zhang 
Ph.D.Candidate
State Key Laboratory for Vegetation and Environmental Change,
Institute of Botany, The Chinese Academy of Sciences
Nanxincun 20,Xiangshan, Beijing 100093
E-mails: 
zhangjl at ibcas.ac.cn
jinlongzhang01 at gmail.com



发件人： Yong Zhang 
发送时间： 2010-12-10  20:29:43 
收件人： r-sig-ecology 
抄送： 
主题： [R-sig-eco] Dissimilarity ranking 
 
Hello all,
If I have 15 sites with the species composition data, how should I get the dissimilarity matrix of those sites? Which function or package should I use? I am green, 
sorry for any inconvenience that I brought to you.
Any of your hint or suggestion will be greatly appreciated.
All the best.
2010-12-10 
Yong Zhang, ph.D.
Lab of aquatic insect & stream ecology
Dept.of Entonology, Nanjing Agricultural University
Nanjing, China 210095
Cell: (+86) 025-84395241
email:2010202035 at njau.edu.cn
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