carol white wrote:
OK but how to generalize so that the max of y would cover for all subsets of b?
because 50:70 was just an example, so consider other subsets (known or unknow
in advance) whose density will be plotted on the histogram.
Take all subsets at first and calculate the max of all those density
estimates of all substes, then plot all the estimates, as I have done
for just 1 sample.
But since b is the full set, why it doesn't contain the max of y for all
subsets?
Consult a textbook about statistics:
Consider a density estimate of just very few numbers with very small
variance (which might happen), you'd get a very high estimate at the center.
Uwe Ligges
thanks
--- On Tue, 4/28/09, Uwe Ligges <lig...@statistik.tu-dortmund.de> wrote:
From: Uwe Ligges <lig...@statistik.tu-dortmund.de>
Subject: Re: [R] truehist and density plots
To: "carol white" <wht_...@yahoo.com>
Cc: r-h...@stat.math.ethz.ch
Date: Tuesday, April 28, 2009, 6:16 AM
carol white wrote:
Consider a vector of 100 elements (attached files). then,
truehist(b)
lines(density(b[20:50]))
How is it possible to have density plots of all subsets like b[20:50]
within histogram (without exceeding the max of historgram on y axis)?
Is it more clear?
Yes, example:
# ignore the first plot:
truehist(b)
yl <- par("usr")[4]
d <- density(b[20:50])
truehist(b, ylim=c(0, max(yl, d$y)))
lines(d)
Uwe Ligges
Best,
--- On Tue, 4/28/09, Uwe Ligges <lig...@statistik.tu-dortmund.de>
wrote:
From: Uwe Ligges <lig...@statistik.tu-dortmund.de>
Subject: Re: [R] truehist and density plots
To: "carol white" <wht_...@yahoo.com>
Cc: r-h...@stat.math.ethz.ch
Date: Tuesday, April 28, 2009, 5:42 AM
carol white wrote:
Hi,
I wanted to plot the histogram of a vector and then, plot the density
function of subsets of the vector on the histogram. So I use truehist in
MASS
package and lines(density) as follows:
length(b) = 1000
truehist(b)
lines(density(b[1:100]))
I do not undertsand what you mean. Can you please provide a *reproducible*
example?
Uwe Ligges
however the density plot of the first 100 points exceeds the max of y
axis
(see attached). how is it possible to make a graphics so that the density
plot
of the subsets doesn't go beyond the maximum of all points in the
complete
set?
Cheers,
Carol
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