[R] histogram - freq=FALSE - density computation
Duncan Murdoch
murdoch at stats.uwo.ca
Fri Aug 8 01:00:02 CEST 2008
On 07/08/2008 6:55 PM, Jörg Groß wrote:
> Hi,
>
> I don't understand what
>
> hist(x, freq=FALSE)
>
> does.
>
>
> At first I thought it would be just the relative frequencies instead
> of the absolute frequencies,
> by just computing "frequencies / n" in every category.
>
> But with a small dataset the y-values (densities) don't sum to one.
>
> Is there a way to get the histogram doing that?
> Or what is the idea of this density-computation?
>
>
> I hope the question is not too stupid...
It returns a probability density function, so the result integrates to
one. If the bars are chosen at unit spacings it will sum to one.
Duncan Murdoch
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