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1.3 Graphs for Categorical Data

A statistical table can be used to display data graphically as a data distribution.

For qualitative data, three measurements are available for the list of categories:

the frequency, or number of measurements

the relative frequency, or proportion

the percentage

A pie chart is the familiar circular graph that shows how the measurements are distributed among the categories.

A bar chart shows the same distribution of measure-ments in categories, with the height of the bar measuring how often a particular category was observed.

A bar chart in which the bars are ordered from largest to smallest is called a Pareto chart.

©1998 Brooks/Cole Publishing/ITP

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