![Comparative histograms: Panel and overlay histograms in SAS](https://blogs.sas.com/content/iml/files/2016/03/overlayhist4.png)
You can use histograms to visualize the distribution of data. A comparative histogram enables you to compare two or more distributions, which usually represent subpopulations in the data. Common subpopulations include males versus females or a control group versus an experimental group. There are two common ways to construct a