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| Module 3: Interpreting Data
5.4 What about qualitative/categorical variables?
When both variables are measured on a nominal or ordinal scale, relationships can be examined using bar charts. The most common way to show these data is to use a table, but side-by-side bar charts and stacked bar charts both allow useful comparisons and content usually determines the best style of graph.
If only one variable is measured on a nominal or ordinal scale, then appropriate graphical techniques are side-by-side box plots, jittered dot plots or stem-and-leaf plots.
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This page last updated 25 November 2009 | 
