`quantile(aval, probs = c(0.25, 0.4))`

# Deriving Quantiles or Percentiles in R

Percentiles can be calculated in R using the quantile function. The function has the argument `type`

which allows for nine different percentile definitions to be used. The default is `type = 7`

, which uses a piecewise-linear estimate of the cumulative distribution function to find percentiles.

This is how the 25th and 40th percentiles of `aval`

could be calculated using the default `type`

.