cutn: Convert numeric to factor, using bins of equal cardinality

In aroneklund/surviplot: Draw Survival Curves with Number-at-Risk

Description

This is similar to cut, except that the breakpoints are chosen such that each bin contains roughly the same number of samples.

Usage

cutn(x, n = 2, right = TRUE, ...)

Arguments

x	A numeric vector.
n	Integer, the (maximum) number of bins. The actual number of bins is limited by the number of unique values in x.
right	see cut
...	Further arguments passed to cut; e.g. "labels", "include.lowest".

Details

Some effort is made to return sensible values, even with repeated values that make completely evenly-sized bins impossible.

Missing values are silently ignored.

Value

A factor of the same length as x.

See Also

cut

Examples

 
  table(cutn(1:100, n = 3))

  ## a practical demonstration:
  ## divide a cohort into two equally-sized strata according to age

  attach(ovarian)
  s <- Surv(futime, fustat)
  
  surviplot(s ~ cutn(age))

  surviplot(s ~ cutn(age, n = 3), stitle = 'Age (years)')

aroneklund/surviplot documentation built on May 10, 2019, 1:47 p.m.