[R] breaks in hist()

[Francisco J. Zagmutt]

Hi Leaf

The word "even" can be interpreted in several ways but I will give it a 
shot.
If you want to specify the breakpoints to represent the aggregation in your 
data you can use the argument breaks within histogram i.e.

x=c(runif(95,0,0.2),runif(5,.21,2))
hist(x, breaks=seq(0,2,.1), freq=F )#It will use breakpoints at 
0,0.1,0.2,...2

or you can also suggest a pre-defined number of cells i.e.
hist(x, breaks=7, freq=F )


You can also add a density line over the histogram using lines
lines(density(x, bw=.1))

Alternativelly, you can use some more basic visualization like a 
stem-and-leaf plot
stem(x)

I hope this helps

Francisco


>From: "Leaf Sun" <leaflovesun at yahoo.ca>
>To: "r-help at stat.math.ethz.ch" <r-help at stat.math.ethz.ch>
>Subject: [R] breaks in hist()
>Date: Wed, 2 Nov 2005 10:48:45 -0700
>
>Dear listers,
>
>A quick question about breaks in hist().
>
>The histogram is highly screwed to the right, say, the range of the vector 
>is [0, 2], but 95% of the value is squeezed in the interval (0.01, 0.2). My 
>question is : how to set the breaks then make the histogram look even?
>
>Thanks in advance,
>
>Leaf
>


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