R-alpha: ECDFs

Thomas Lumley thomas@biostat.washington.edu
Tue, 19 Aug 1997 11:55:34 -0700 (PDT)

On Tue, 19 Aug 1997, Kurt Hornik wrote:
> Here's something what is needed for teaching elementary statistics:
> Given a sample vector x, compute the corresponding ECDF, plot it, and
> perhaps evaluate it at points other than the data points.

The approx() function is supposed to do this (it currently only does
linear interpolation).  If the right and left continuous step functions
were added to approx then we could easily use approxfun to define the ECDF
as a function closure, making it automatically available at any point you
want. After all, the ECDF *is* a function.

Thomas Lumley
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