Description Usage Arguments Details Value Author(s) References See Also Examples
resamp.3x
is used for resampling data within a community dataset
1 | resamp.3x(obj, level=0.1)
|
obj |
a community dataset in spacodiR format (see |
level |
a proportion specifying the extent of data shuffling |
A resampling procedure for a species-by-plots matrix, based on Gotelli swapping.
Shuffles abundances within species and for a pair of plots. The level
defines
the degree of sampling, with larger values dictating a higher level of reshuffling.
For instance, if level = 0.1
and the dataset involves 20 species and 20 plots,
a total of 40 (0.1x20x20
) Gotelli-like swaps are performed. The number of swaps is always rounded up such that at least one swap is performed (i.e., when level=0
).
A shuffled dataset
Jonathan Eastman
HARDY OJ. 2008. Testing the spatial phylogenetic structure of local communities: statistical performances of different null models and test statistics on a locally neutral community. Journal of Ecology 96:914-926.
GOTELLI NJ. 2000. Null model analysis of species co-occurrence patterns. Ecology 81:2606-2621.
spacodi.by.nodes
for permutation tests of community diversity and additional randomization methods;
see spacodi.calc
for the main underlying function; randomizeMatrix
1 2 3 4 5 6 | data(sp.example)
attach(sp.example)
spl
# shuffle dataset
resamp.3x(obj=spl, level=0.2)
|
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