[R] cumulative distribution functions

Duncan Murdoch dmurdoch at pair.com
Mon Nov 17 20:05:10 CET 2003

On Mon, 17 Nov 2003 18:30:08 -0000, "Monica Palaseanu-Lovejoy"
<monica.palaseanu-lovejoy at stud.man.ac.uk> wrote :

>hi y'all,
>I am wondering if there is any special command, function, 
>package, etc to help me doing a cumulative distribution function, 
>with y-scale - probability scale.
>I tried the help in R and i got the following answers:
>cumsum(base)            Cumulative Sums, Products, and Extremes
>ecdf(stepfun)           Empirical Cumulative Distribution Function
>cpgram(ts)              Plot Cumulative Periodogram
>But i could not find either (stepfun) nor (ts) packages to read the 
>specific help. Are they discarded? The "cumsum" seems not to do 
>what i really was after.

You need to execute "library(stepfun)" before help for ecdf will work.

In general, the notation is

topic(package)	Description

and you need library(package) to see ?topic.

Duncan Murdoch

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