Example 8.40: Side-by-side histograms

June 13, 2011

(This article was first published on SAS and R, and kindly contributed to R-bloggers)

It’s often useful to compare histograms for some key variable, stratified by levels of some other variable. There are several ways to display something like this. The simplest may be to plot the two histograms in separate panels.

In SAS, the most direct and generalizable approach is through the sgpanel procedure.

proc sgpanel data = 'c:\book\help.sas7bdat';
panelby female;
histogram cesd;

The results are shown above.

In R, the lattice package provides a similarly direct approach.

ds = read.csv("http://www.math.smith.edu/r/data/help.csv")
ds$gender = ifelse(ds$female==1, "female", "male")
histogram(~ cesd | gender, data=ds)

The results are shown below.

To leave a comment for the author, please follow the link and comment on his blog: SAS and R.

R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Tags: , , , , ,

Comments are closed.