[R] hist density...

[Prof Brian Ripley]

A density integrates to one, so the total area of the bins is one.
It's your `Thought' which is incorrect.

For hist(freq=FALSE) the area of each rectangle (not its height) 
represents the proportion of the data falling into the base of the 
rectangle.

On Tue, 17 Jun 2003, wolski wrote:

> Hi!
> Do not understand following behavior.
> 
> 
> > summary(test$dif)
>    Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
>  0.7389  0.9713  0.9850  0.9818  1.0000  1.0000 
> length(test$dif)
> [1] 85879
> 
> 
> tmp <- hist(test$dif,breaks=100,freq=FALSE)
> 
> The density on the Y axis in the plot are in the range 0-200. 
> Thought that the density should be in the range 0-1 
> (something like tmp$count/length(test$dif))?
> 
> 
> Eryk
> 
> P.S.
> In case of frequencies all are fine for the dataset.
> 
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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