Description Usage Arguments Value Author(s) References See Also Examples
Togetherness, or T-score, describes the level of similarity in the distributional pattern of two species. Originally proposed by Stone & Roberts (1992) for biogeographical situations can it also be applied e.g. to pollinators on different host plants.
1 | togetherness(web, normalise=TRUE, FUN = mean, ...)
|
web |
A matrix with binary or counted interactions/links, where the higher trophic level is represented by columns. |
normalise |
Logical; shall index be normalised to a range of 0-1? |
FUN |
The function to summarise species-pair T-scores with; defaults to mean. |
... |
Arguments passed on to |
Returns the average (default) togetherness of all species combinations.
Carsten F. Dormann
Stone, L. and Roberts, A. (1992) Competitive exclusion, or species aggregation? An aid in deciding. Oecologia 91, 419–424
C.score
for another of Stone & Roberts' indices.
1 2 3 4 5 6 7 8 | (m <- matrix(c(0,1,0,0,1,1,0,1,1,0), ncol=2, byrow=TRUE))
togetherness(m)
# or, with two togethernesses:
(n <- matrix(c(0,1,1,0,1,1,0,0,1,1,0,1,0,1), ncol=2, byrow=TRUE))
togetherness(n, normalise=FALSE)
data(Safariland)
togetherness(m)
|
Loading required package: vegan
Loading required package: permute
Loading required package: lattice
This is vegan 2.4-4
Loading required package: sna
Loading required package: statnet.common
Attaching package: 'statnet.common'
The following object is masked from 'package:base':
order
Loading required package: network
network: Classes for Relational Data
Version 1.13.0 created on 2015-08-31.
copyright (c) 2005, Carter T. Butts, University of California-Irvine
Mark S. Handcock, University of California -- Los Angeles
David R. Hunter, Penn State University
Martina Morris, University of Washington
Skye Bender-deMoll, University of Washington
For citation information, type citation("network").
Type help("network-package") to get started.
sna: Tools for Social Network Analysis
Version 2.4 created on 2016-07-23.
copyright (c) 2005, Carter T. Butts, University of California-Irvine
For citation information, type citation("sna").
Type help(package="sna") to get started.
This is bipartite 2.08
For latest changes see versionlog in ?"bipartite-package".
For citation see: citation("bipartite").
Have a nice time plotting and analysing two-mode networks.
Attaching package: 'bipartite'
The following object is masked from 'package:vegan':
nullmodel
[,1] [,2]
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[2,] 0 0
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[4,] 0 1
[5,] 1 0
[1] 0.1666667
[,1] [,2]
[1,] 0 1
[2,] 1 0
[3,] 1 1
[4,] 0 0
[5,] 1 1
[6,] 0 1
[7,] 0 1
[1] 2
[1] 0.1666667
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