Hello,

I am wondering how to test for the relative effects of different species in
an abundance matrix that I am analyzing with manyglm in the mvabund
package.

e.g., in the package example,

data(spider)

$abund
   Alopacce Alopcune Alopfabr Arctlute Arctperi Auloalbi Pardlugu Pardmont
Pardnigr Pardpull Trocterr Zoraspin
1        25       10        0        0        0        4        0       60
      12       45       57        4
2         0        2        0        0        0       30        1        1
      15       37       65        9
3        15       20        2        2        0        9        1       29
      18       45       66        1
4         2        6        0        1        0       24        1        7
      29       94       86       25
5         1       20        0        2        0        9        1        2
     135       76       91       17
6         0        6        0        6        0        6        0       11
      27       24       63       34
7         2        7        0       12        0       16        1       30
      89      105      118       16
8         0       11        0        0        0        7       55        2
       2        1       30        3
9         1        1        0        0        0        0        0       26
       1        1        2        0
10        3        0        1        0        0        0        0       22
       0        0        1        0
11       15        1        2        0        0        1        0       95
       0        1        4        0
12       16       13        0        0        0        0        0       96
       1        8       13        0
13        3       43        1        2        0       18        1       24
      53       72       97       22
14        0        2        0        1        0        4        3       14
      15       72       94       32
15        0        0        0        0        0        0        6        0
       0        0       25        3
16        0        3        0        0        0        0        6        0
       2        0       28        4
17        0        0        0        0        0        0        2        0
       0        0       23        2
18        0        1        0        0        0        0        5        0
       0        0       25        0
19        0        1        0        0        0        0       12        0
       1        0       22        3
20        0        2        0        0        0        0       13        0
       0        0       22        2
21        0        1        0        0        0        0       16        1
       0        1       18        2
22        7        0       16        0        4        0        0        2
       0        0        1        0
23       17        0       15        0        7        0        2        6
       0        0        1        0
24       11        0       20        0        5        0        0        3
       0        0        0        0
25        9        1        9        0        0        2        1       11
       6        0       16        6
26        3        0        6        0       18        0        0        0
       0        0        1        0
27       29        0       11        0        4        0        0        1
       0        0        0        0
28       15        0       14        0        1        0        0        6
       0        0        2        0

is there a way analogous to the simper method for distance matrices to test
whether Alopacce is important in determining a significant effect of a
treatment factor
in a model that looked at manyglm(abund~treatment)?

Many thanks,
Beth



-- 
****************************************************
Elizabeth G. Pringle
Michigan Society of Fellows
University of Michigan
****************************************************

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