[R] Histogram question

[Liaw, Andy]

You can do it "by hand"; e.g.,

x <- rnorm(50)
x.hist <- hist(x, prob=TRUE, plot=FALSE)
x.prob <- x.hist$count / length(x)
## Alternatively:
x.prob <- diff(x.hist$breaks) * x.hist$density

You can then use barplot or whatever you like to plot x.prob.

HTH,
Andy

> -----Original Message-----
> From: Erin Hodgess [mailto:hodgess at gator.dt.uh.edu] 
> Sent: Tuesday, September 02, 2003 4:38 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Histogram question
> 
> 
> Dear R People:
> 
> When the "hist" command is used with the probability = T, the 
> results are such that the height x the width of each bar 
> would represent the relative frequency.
> 
> Is there a way to adjust the hist function such that the bars 
> have the 
> height of the relative frequency (without regard to width), please?
> 
> I was experimenting with the "truehist" function and changed 
> the code for the "est" value.  However, the y axis labels are 
> not at the same levels between the prob = T and prob = F when 
> that change is made.
> 
> This is R 1.7.1 for Windows.
> 
> thanks in advance!!!!!
> 
> Sincerely,
> Erin Hodgess
> mailto: hodgess at gator.uhd.edu
> 
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