[R] Cumulative Density Plots (Hmisc/lattice)

Frank E Harrell Jr f.harrell at vanderbilt.edu
Tue Jan 17 22:57:40 CET 2006

Mike Bock wrote:
> I have been using the ECDF function in the Hmisc package to produce
> cumulative distribution function plots. The problem is that for small
> datasets the steps "look bad" (not my characterization but from the
> client). Is there a way to get the same information but smoothed? I have
> tried the densityplot (lattice), which gives a smoothed line, but this
> does not give the cumulative density. 
> Michael Bock, PhD
> ENVIRON International Corporation
> 136 Commercial Street, Suite 402
> Portland, ME 04101
> phone: 207.347.4413
> fax: 207.347.4384

That will invalidate the definition of ECDF.  I've never had a client 
complain about it before.


Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

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