Re: [R] Cumulative Density Plots (Hmisc/lattice)

2006-01-17 Thread Deepayan Sarkar
On 1/17/06, Mike Bock [EMAIL PROTECTED] 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/

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Re: [R] Cumulative Density Plots (Hmisc/lattice)

2006-01-17 Thread Frank E Harrell Jr
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.

FH


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

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