## Overview

Teaching:10 min

Exercises:10 minQuestions

What kind of scientific question does a line histogram address?

How do I generate a line histogram with

`ggplot2`

?Objectives

To generate a line histogram using

`ggplot2`

Walk through decision making steps from question to chart.

- “How was the population of Africa distributed across the continent by country in 2007?”
- Single variable distribution with many points
- Line Histogram

Implement line histogram.

`geom_histogram()`

`geom_density()`

## Line Histogram Fill-in Challenge

Fill in the missing pieces of the following code to generate a line histogram.

`ggplot(Africa, aes(________, ..count..)) + geom_density() ________ labs(x = "Log10(________)", y = "Count")`

## Output Solution

## Code Solution

`ggplot(Africa, aes(log10(pop_2007), ..count..)) + geom_density() + labs(x = "Log10( 2007 Population )", y = "Count")`

## Key Points

Line histograms represent a single variable distributions with many points.