Explainer: Histograms

In this explainer, we will learn how to use histograms to analyze data, communicate information, and get insights from data.

One of the ways we gain information from a data set is by displaying the data in a graph or plot. A histogram (sometimes called a frequency graph) is a type of graph used to display data.

A histogram looks quite similar to a bar chart, but while a bar chart is used for data that has been counted for a set of categories, for example, colors, a histogram is used to display numerical data. Remember that a numerical data set is one in which the values are measurements, like height, weight, or age. We say that the variable (the thing that varies, e.g., height) is numerical. In a histogram, the variable, which is usually on the horizontal axis, is split into ranges of measurements.