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2000 May 03
0
Combinatorics for nonparametric tests
...ing certain nonparametric tests like Mann-Whitney-Wilcoxon,
Kruskal-Wallis and Spearman's rank correlation. I have written a
function all.perm which delivers all permutations of 1,2,...,n and
which works reasonably well. This can be used to generate P(R=r) of
Spearman's rank correlation:
n_6;plot(table(apply(all.perm(n),1,cor,y=1:n)),type="h")
all.perm_function(n){
p_matrix(1,ncol=1)
for(i in 2:n){p_pp_cbind(p,i)
v_c(1:i,1:(i-1))
for(j in 2:i){v_v[-1]
p_rbind(p,pp[,v[1:i]])}}
p}
Until now I hesitated to dwell on writing functions to generate all
n!/(k!(n-k)!) k-combinatio...