Usage
antithetic.array(n, R, L, strata)
anti.arr(n, R, L, inds=1:n)
balanced.array(n, R, strata)
extra.array(n, R, m, strata=rep(1,n))
importance.array(n, R, weights, strata)
importance.array.bal(n, R, weights, strata)
index.array(n, R, sim, strata=rep(1,n), m=0, L=NULL, weights=NULL)