--- Thomas Lumley <[EMAIL PROTECTED]> wrote: > 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: > > No, it provides probability *densities*, which *integrate* to 1. > > That is, the height of the bar is the relative frequency divided by the > width of the interval. This is important because > - it means histograms with different cutpoints are comparable > - it means histograms are comparable with mathematical densities such as > a Normal, and with kernel density estimates > - it means that the bars don't have to have the same width. > > If histograms plotted relative frequencies there would be no need to > distinguish them from barplots. > > -thomas > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help
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