randomizing a community phylogenetics matrix: '1a' of Hardy (2008)
resamp.1a is used for resampling data within a community dataset
resamp.1a(obj, abund.class.ratio = 4)
a community dataset in spacodiR format (see
a ratio defining abundance classes
A resampling procedure for a species-by-plots matrix, where species are shuffled within abundance classes.
Species are grouped into distinct abundance classes characterized by a fixed ratio:
abund.class.ratio = maximal abundance / minimal abundance. For instance, if
abund.class.ratio = 4,
the limits between abundance classes could be 1, 4, 16, ... . Species are randomly permuted within each
class, which maintains most of the abundance phylogenetic structure originally present in a dataset.
A shuffled dataset
Timothy Paine and 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.
spacodi.by.nodes for permutation tests of community diversity and additional randomization methods;
spacodi.calc for the main underlying function;
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