[R] Normalized Y-axis for Histogram Density Plot
Greg Snow
Greg.Snow at imail.org
Wed Sep 2 18:55:02 CEST 2009
Your data ranges from 0.67 to 1.21, just to simplify things let's assume the that the histogram will go from the pretty numbers of 0.65 to 1.25 for a total width of 0.6. Now consider the simplest histogram consisting of 1 single bar going from 0.65 to 1.25 (very uninteresting histogram, but good for this example). The probability=T argument means that the total area of the histogram (1 rectangle for this simple case) must be equal to 1.
If you can explain to us how to create a rectangle with width = 0.6 and area =1 and a height that is between 0 and 1, then we will be happy to explain the rest of your question (though I expect that trying to answer the above will answer your question for you).
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Gundala Viswanath
> Sent: Tuesday, September 01, 2009 10:17 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Normalized Y-axis for Histogram Density Plot
>
> I have the following data which I tried to draw
> the probability density plot.
>
> Here is the code I have:
>
> x <- read.table("mydat.txt");
> d <- rep(x$V2,times=x$V3);
> hist(d,probability=T, xlab="FlowSignal");
>
> But why the y-axis range from 0 to 6,
> instead of 0 to 1? What's the correct way to plot it?
>
>
> #id flowsignal frequency
> 1 0.67 1
> 1 0.70 1
> 1 0.75 1
> 1 0.78 2
> 1 0.79 1
> 1 0.83 1
> 1 0.84 3
> 1 0.85 3
> 1 0.86 1
> 1 0.88 1
> 1 0.89 1
> 1 0.91 1
> 1 0.93 1
> 1 0.94 1
> 1 0.96 2
> 1 0.98 4
> 1 0.99 2
> 1 1.00 2
> 1 1.01 1
> 1 1.02 5
> 1 1.04 3
> 1 1.05 5
> 1 1.06 5
> 1 1.07 4
> 1 1.08 7
> 1 1.09 6
> 1 1.10 2
> 1 1.11 2
> 1 1.14 1
> 1 1.15 1
> 1 1.17 1
> 1 1.20 1
> 1 1.21 1
> #end of data
>
>
> Regard,
> G.V.
>
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