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 [[alternative HTML version deleted]]
On 1/17/06, Mike Bock <mbock at environcorp.com> 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.Have you tried qqmath, perhaps with distribution=qunif? Except for the transposition, the idea behind the plots are similar. Deepayan -- http://www.stat.wisc.edu/~deepayan/
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: 207.347.4384That will invalidate the definition of ECDF. I've never had a client complain about it before. FH -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University
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