- normal curve
- population pyramid
For one variable
Use a histogram to show a distribution of data. Use small gaps between the bars to emphasise the profile of the data.
Example of histrogram chart showing one variable
Usually resident population aged 0 to 21 years
For two variables
Use a population pyramid to show the distribution of comparable data sets and highlight differences in the profile of the data.
Example of population pyramid showing two variables
For more than two variables
To compare four variables population pyramids can be overlaid, with the least important data set displayed using an outline pyramid instead of bars.
Example of population pyramid showing multiple variables
Small multiple charts can also be used for multiple distributions. Use the same scale to enable comparison across charts.
Example of small multiples chart
Box-plots can also be used to compare distributions with two or more variables.