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Bar charts and pie charts

Bar charts and pie charts


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A more graphical approach of visualizing frequencies is the bar chart. In a bar chart, each category is represented by a bar that indicates the frequency of its class by its height. It is mostly used with nominal and ordinal scales. The bars in such a chart should be separated to indicate that it is a qualitative variable, to avoid confusion with a histogram. A compound bar chart or a multiple bar chart can be used to display two variables in one chart. Another similar and well-known way to display categorical variables is the pie chart. The biggest advantage of the pie chart over the bar chart is that you can have the pie differ proportionally in size to reflect the total amount of items, which is very useful when comparing different samples.

Research topics: Software & Technology