Displaying 2 results from an estimated 2 matches for "tswap".
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2012 Jan 24
2
Null models of species co-occurrence
I am currently testing species co-occurrence patterns using null models and
the oecosimu() function within the vegan() package. My issue is that none of
the methods appear to be the ones that I want. The methods listed are r0,
r1, r2, r2dtable, swap, tswap. However, I want to know how to go about
implementing fixed row algorithms, as suggested in Gotelli 2000 in Ecology.
Also, the null models created seem to be incredibly dependent on the 1)
burnin and 2) thin values. These are the 1) Number of null communities
discarded before proper analysis in s...
2010 Aug 30
1
lost in vegan package
...ckerboard units for each
species pair of a matrix. I've prepared the function:
pair.checker=function (dataset) {designdist (dataset,
method="c("(A-J)x(B-J)", terms ="binary", abcd=FALSE)}
to use with function oecosimu as follows:
oecosimu(dataset, pair.checker, "tswap", nsimul=5000, burnin=0, thin=thin,
statistic="pair.checker")
It seemed to work but the output did not include each species pair name. I
don't know what to do. First column was all NAs. I copied and pasted the
results of the console and named each species pair in Excel by hand....