permtests {clinfun} | R Documentation |
Small sample tests using the permutation reference distributions.
permlogrank(formula, data, subset, na.action, rho=0, nperm=5000) jonckheere.test(x, g, alternative = c("two.sided", "less", "greater"))
nperm |
number of permutations for the reference distribution |
formula, data, subset, na.action, rho |
see survdiff for details |
x, g |
data and group vector |
alternative |
less = means are increasing, greater = means are decreasing, two.sided = either |
permlogrank is the permutation version of k-sample survdiff
jonckheere.test is the exact (permutation) version of the Jonckheere-Terpstra test. The asymptotic version is equivalent to cor.test(x, g, method="k").