A histogram has area one, not sum one. From ?truehist
Details:
This plots a true histogram, a density estimate of total area 1.
On Sat, 8 Mar 2003, juli g. pausas wrote:
> Hi,
> This is a very basic question, but I would like to undestand hist(). I
> thought that the hist( , freq=FALSE) should provide the relative
> frequencies (probabilities), and so they should sum 1, however:
>
> set.seed(2)
> ah <- hist(rnorm(100), freq=F)
> sum(ah$intensities)
> [1] 2
>
> set.seed(2)
> bh <- hist(rlnorm(100), freq=F)
> sum(bh$intensities)
> [1] 0.4999996
>
> I'm getting similar figures with truehist() in MASS.
> So I suppose I'm misunderstanding hist(). Any help?
>
> Thanks
>
> Juli
>
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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