A clustered bar chart displays more than one data series in clustered horizontal columns. Each data series shares the same axis labels, so horizontal bars are grouped by category. Clustered bars allow the direct comparison of multiple series in a given category, but it's more difficult for the human eye to compare the same data series across categories.
Like clustered column charts, clustered bar charts become visually complex as the number of categories or data series increase. They work best in situations where data points are limited.
Allow direct comparison of multiple data series per category
Can show change over time
More difficult to compare a single series across categories
Become visually complex as categories or series are added
Bar charts are great for comparing things, because it's easy to see how bar lengths differ. This chart is an example of a clustered bar chart showing product units sold this year versus last year. The data used for this...
Which countries have the longest life expectancy? Bar charts work well for this kind of data because (1) the bars are easy to compare and (2) there is plenty of room for labels on the vertical axis.
Here is the data...