# HISTOGRAM

## What is a histogram used for

In statistics a histogram is a graphical representation of the distribution of data

## How to create one

1. Using a ruler, draw out the basic axes. These are the vertical and horizontal lines that form basic outline of the histogram
2. Measure out the groups. so you'll need to make set marks along your lower axis
3. Measure out the vertical axis. The vertical axis in a histogram is always for frequency. What measure of time is necessary, though, is up to your data of course

## PROS & CONS

PROS: Good for helping you get an understanding of the distribution of data

CONS: Pick the wrong groupings and it can change the way you see the data. May want to try multiple groupings/categories.

## FEATURES

Generally a histogram will have bars of equal width, although this is not the case when class intervals vary in size. Choosing the appropriate width of the bars for a histogram is very important. As you can see in the example above, the histogram consists simply of a set of vertical bars. Values of the variable being studied are measured on an arithmetic scale along the horizontal x-axis