Shuffles a sequence within groups defined by the input vector
Used to generate a permutation of a sequence 1:length(lev). observations are permutted within blocks, according to the vector lev passed to the function.
samp.within(lev)
lev |
a vector containing the group to which belongs the observations to be permuted. |
a vector 1:length(lev) (with blocks defined by
lev
) randomly permuted. Usually, one passes the result to reorder observations in a data set in order to carry out permutation-based tests.
Jerome Goudet, DEE, UNIL, CH-1015 Lausanne Switzerland
Goudet J. (2005). Hierfstat, a package for R to compute and test variance components and F-statistics. Molecular Ecology Notes. 5:184-186
samp.within(rep(1:4,each=4)) #for an application see example in g.stats.glob
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