[R] hist densities

This is a reply to Luke Spadavecchia's question about hist densities. If you want to construct a histogram where the bar heights are the percentage of observations in the intervals you can use this code: x-rnorm(n=5000,mean=1.5,sd=0.25) h-hist(x) h$density-h$counts/sum(h$counts)

[R] hist densities

Hi there, I was wondering why x-rnorm(n=5000,mean=1.5,sd=0.25) h-hist(x) sum(h$density) [1] 10 I thought the integral of the histogram should be one? These seems strange to me, or am I being silly... Regards Luke Spadavecchia PS. I'm using R 2.5.1 on Mac OSX

Re: [R] hist densities

On Fri, 21 Mar 2008, Luke Spadavecchia wrote: Hi there, I was wondering why x-rnorm(n=5000,mean=1.5,sd=0.25) h-hist(x) sum(h$density) [1] 10 I thought the integral of the histogram should be one? These seems strange to me, or am I being silly... The integral is not a sum of heights