A density histogram is a useful way to visualize the distribution of a dataset. It combines the features of a histogram and a density plot, allowing you to see both the frequency of data points and the estimated probability density function.

Using Base R

To create a density histogram in base R, you can use the hist() function with the prob = TRUE argument. This will scale the histogram to represent a density rather than a frequency. You can then add a density curve using the density() function and the lines() function.

Here is an example:

In this example, the hist() function creates a histogram of the data x with density scaling. The lines() function adds a density curve to the histogram¹.

Using ggplot2