Spencer Graves
p.s. This is discussed in Venables and Ripley (2002) Modern Applied Statistics with S, 4th ed., which I recommend highly for anyone who uses S-Plus or R. I only wish I had gotten the first edition when it appeared.
Jim McLoughlin wrote:
Hi folks
I'm trying to plot a normalized frequency histogram of some data. After checking the docs, it seems there is no built in feature for this.
from the definition for normalized frequency, I need to divide the relative frequency by the size of the intervals being used.
So I could divide the series by this interval length, and then plot the relative frequency.
The problem is determining the interval length that will be used in advance. I'm supposed to manually pick the # of intervals between 20 and 40 (not use sturges). However, when I try different values for the nbreaks parameters, incrementing from 20 - 40, the histogram only changes at a couple of points on that interval.
Anyone have any suggestions as to how I should create this plot? Or an explanation as to why my nbreaks parameter does not seem to force the number of intervals, but rather suggests a ballpark to be in?
thanks
Jim M
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