[R] cumulative frequency distribution plot

Wiener, Matthew matthew_wiener at merck.com
Tue Jun 24 20:55:35 CEST 2003


You can also take a look at "ecdf" in the "stepfun" package.

Hope this helps,
Matt

-----Original Message-----
From: Spencer Graves [mailto:spencer.graves at pdf.com] 
Sent: Tuesday, June 24, 2003 2:39 PM
To: Tommy E. Cathey
Cc: r-help at r-project.org
Subject: Re: [R] cumulative frequency distribution plot


	  It depends on what you mean by that.  Consider the following:

 > x <- rnorm(100)
 > plot(x, pnorm(x))

	  This plot is a cdf of pseudo-normal data.

	  I've seen many people make these things, and I've never understoon

what they see in these plots that they can't see better in a normal 
probability plot:

 > qqnorm(x, datax=T)

	  What can you see in the first type plot that is not so easily seen
in 
the second?

Spencer Graves

Tommy E. Cathey wrote:
> Does R do cumulative frequency distribution plots?
> 
> --
> Tommy E. Cathey, Senior Scientific Application Consultant
> High Performance Computing & Scientific Visualization
> SAIC, Supporting the EPA
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