This help topic is for R version 0.60. For the current version of R, try https://stat.ethz.ch/R-manual/R-patched/library/base/html/quantile.html
quantile {base}R Documentation

Sample Quantiles

Description

quantile produces sample quantiles corresponding to the given probabilities. The smallest observation corresponds to a probability of 0 and the largest to a probability of 1.

Usage

quantile(x, probs=seq(0, 1, 0.25), na.rm=FALSE)
[Package base version 0.60 ]