Re: [R] Need to compute density as done by panel.histogram
On 2011-08-02 11:51, Sébastien Bihorel wrote: Hi, This might be a simple problem but I don't know how to calculate a random variable density the way panel.histogram does it before it creates the actual density rectangles. The documentation says that it uses the density function but the actual code suggests that the hist.constructor function (which does not seem to be easily accessible). The documentation in ?histogram is misleading. I think that the intent is that density() is used in panel.densityplot but panel.histogram uses hist(), as is clear in ?panel.histogram. So you'll find the code for the density rectangles in hist.default where 'counts' is computed and followed with dens - counts/(n * diff(breaks)) You might find the code for truehist() in the MASS package easy to follow. To see how hist.constructor calls hist(): lattice:::hist.constructor Peter Ehlers Any suggestion for computing the density values of foo$x in the following example will be welcome. require(lattice) set.seed(12345) foo1- data.frame(x=rnorm(100,0,0.1),grp=1,by=rep(1:2,each=50),by2=rep(1:2,times=50)) foo2- data.frame(x=rnorm(100,2,1),grp=2,by=rep(1:2,each=50),by2=rep(1:2,times=50)) foo- rbind(foo1,foo2) xplot- histogram(~x,data=foo, type='density') PS: the present question relates to a workaround for another problem previously submitted to the list ( https://stat.ethz.ch/pipermail/r-help/attachments/20110727/5f0a8853/attachment.pl). [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Need to compute density as done by panel.histogram
Thank you very much Peter, I'm going to dig deeper into the code of the functions you've listed. On Wed, Aug 3, 2011 at 6:57 AM, Peter Ehlers ehl...@ucalgary.ca wrote: On 2011-08-02 11:51, Sébastien Bihorel wrote: Hi, This might be a simple problem but I don't know how to calculate a random variable density the way panel.histogram does it before it creates the actual density rectangles. The documentation says that it uses the density function but the actual code suggests that the hist.constructor function (which does not seem to be easily accessible). The documentation in ?histogram is misleading. I think that the intent is that density() is used in panel.densityplot but panel.histogram uses hist(), as is clear in ?panel.histogram. So you'll find the code for the density rectangles in hist.default where 'counts' is computed and followed with dens - counts/(n * diff(breaks)) You might find the code for truehist() in the MASS package easy to follow. To see how hist.constructor calls hist(): lattice:::hist.constructor Peter Ehlers Any suggestion for computing the density values of foo$x in the following example will be welcome. require(lattice) set.seed(12345) foo1- data.frame(x=rnorm(100,0,0.1),**grp=1,by=rep(1:2,each=50),by2=** rep(1:2,times=50)) foo2- data.frame(x=rnorm(100,2,1),**grp=2,by=rep(1:2,each=50),by2=** rep(1:2,times=50)) foo- rbind(foo1,foo2) xplot- histogram(~x,data=foo, type='density') PS: the present question relates to a workaround for another problem previously submitted to the list ( https://stat.ethz.ch/**pipermail/r-help/attachments/** 20110727/5f0a8853/attachment.**plhttps://stat.ethz.ch/pipermail/r-help/attachments/20110727/5f0a8853/attachment.pl ). [[alternative HTML version deleted]] __** R-help@r-project.org mailing list https://stat.ethz.ch/mailman/**listinfo/r-helphttps://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/** posting-guide.html http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Need to compute density as done by panel.histogram
Hi, This might be a simple problem but I don't know how to calculate a random variable density the way panel.histogram does it before it creates the actual density rectangles. The documentation says that it uses the density function but the actual code suggests that the hist.constructor function (which does not seem to be easily accessible). Any suggestion for computing the density values of foo$x in the following example will be welcome. require(lattice) set.seed(12345) foo1 - data.frame(x=rnorm(100,0,0.1),grp=1,by=rep(1:2,each=50),by2=rep(1:2,times=50)) foo2 - data.frame(x=rnorm(100,2,1),grp=2,by=rep(1:2,each=50),by2=rep(1:2,times=50)) foo - rbind(foo1,foo2) xplot - histogram(~x,data=foo, type='density') PS: the present question relates to a workaround for another problem previously submitted to the list ( https://stat.ethz.ch/pipermail/r-help/attachments/20110727/5f0a8853/attachment.pl). [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
