On 14 May 2010, at 16:09, Thomas Stewart wrote: > Please be more specific with your question. Perhaps a simple subset of the > data you are trying to plot? Here is some non-specific advice: > > Plotting histograms as percentages instead of frequency counts is already an > option of the hist function. For example, > > pop1<-rnorm(100) > hist(pop1,freq=F)
What you get is a desity, not a percentage, so you could have two bars with a value greater 0.5 on the y-axis. The fact that the area sums up to 1 does not mean that the sum of the heights adds up to 1 --the thing that my ignoramus want to see to understand. On the other hand, freq =T gives the counts, and the sum of the counts is the population total -- therefore (bar counts)/(pop total) *100 is the precentage. If I could slap that on the label of the y-axis I'd be sorted. > > If you are plotting two histograms side-by-side (on the percentage scale), > the y-axis of both plots can be set with the ylim option. For example, > > par(mfrow=c(1,2)) > pop1<-rnorm(100) > hist(pop1,freq=F,ylim=c(0,1)) > pop2<-rgamma(100,1,1) > hist(pop2,freq=F,ylim=c(0,1)) I'm using multhist(). The above would not work for me. F > > If your question were clearer, I might be able to help in more specific ways. > > -tgs > > On Fri, May 14, 2010 at 10:19 AM, Federico Calboli <f.calb...@imperial.ac.uk> > wrote: > Hi All, > > I am in the annoying position of having to present some data to someone who > seems to be somewhat less than numerate. I need to label the y-axes of a > multhist with the y-axis labeled not as counts but as percentage of a > population. Plotting the standard histogram is in a way fine, all I need is > to: > > -- have a left-handside y-axis labels for pop 1 and a right-handside y-axis > labels for pop2 > -- replace the counts in each axis with population percentages (easy to > calculate, but how to stick them there?) > > Any suggestion would be gratefully received. > > F > > > -- > Federico C. F. Calboli > Department of Epidemiology and Biostatistics > Imperial College, St. Mary's Campus > Norfolk Place, London W2 1PG > > Tel +44 (0)20 75941602 Fax +44 (0)20 75943193 > > f.calboli [.a.t] imperial.ac.uk > f.calboli [.a.t] gmail.com > > ______________________________________________ > 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. > -- Federico C. F. Calboli Department of Epidemiology and Biostatistics Imperial College, St. Mary's Campus Norfolk Place, London W2 1PG Tel +44 (0)20 75941602 Fax +44 (0)20 75943193 f.calboli [.a.t] imperial.ac.uk f.calboli [.a.t] gmail.com ______________________________________________ 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.
