[R] probability histogram question
Alec Stephenson
astephen at efs.mq.edu.au
Fri Aug 20 02:51:07 CEST 2004
Alec Stephenson
Department of Statistics
Macquarie University
NSW 2109, Australia
>>> Joseph LeBouton <lebouton at msu.edu> 08/20/04 10:28am >>>
Alec,
Thanks for your reply. I guess what I'm getting at is that I to plot
the histogram such that the HEIGHT of each bar represents the
proportion
of that class in the sample. From your reply I gather that the AREA of
each bar is currently representing the proportion.
My current work-around is to not plot the histogram immediately; I set
it up (with plot=F), divide h$density by 10, then plot h;
x <- runif(100,0,1)
h <- hist(x, freq=F, plot=F)
h$density <- h$density/10
plot(h, freq=F)
while this is up to my normal hacking modus operandi, it's not terribly
efficient. Is there another way to do that? Or is what I'm trying to
do a perceptually and/or statistically incorrect way to think about
histograms?
Quick responses to each sentence in this paragraph:
1) Seems perfectly fine to me.
2) Not that I know of.
3) A histogram can be thought of as a density estimate. If you change
the scale on the x-axis, you are no longer plotting a histogram.
Yours,
Alec
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