## Agenda

Learn to construct and use histograms to examine the underlying distribution of a continuous variable. Specifically

- create a bare bones histogram
- specify the number of bins/intervals
- represent frequency density on the Y axis
- add colors to the bars and the border
- add labels to the bars

## Introduction

A histogram is a plot that can be used to examine the shape and spread of continuous data. It looks very similar to a bar graph and can be used to detect outliers and skewness in data. The histogram graphically shows the following:

- center (location) of the data
- spread (dispersion) of the data
- skewness
- outliers
- presence of multiple modes

## Histograms

To construct a histogram

- the data is split into intervals called bins
- the intervals may or may not be equal sized
- for each bin, the number of data points that fall into it are counted (frequency)
- the Y axis of the histogram represents the frequency and
- the X axis represents the variable

## Histogram