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Box and Whisker Plots (Box Plots).
Box and Whisker Charts (Box Plots) are commonly used in the display of statistical analyses. Unfortunately, Microsoft Excel does not have a built in Box and Whisker chart type. You can create your own custom Box and Whisker charts, using stacked bar or column charts and error bars, in combination with line or XY scatter chart series to show additional data. Note: there are several different ways that box and whisker plots describe sample data. The charts described in these tutorials have boxes indicating the range of the second and third (inner) quartiles of the data, with error bars indicating the first and fourth (outer) quartiles. The whiskers may alternatively show a more rigorously defined upper control limit, and special markers may be used to indicate outliers beyond these. Any such alternatives are beyond the scope of this exercise. There are other web pages that show how to make Box and Whisker Charts in Excel. These sources predate mine, and the techniques are not as extensive.
Vertical Box and Whisker Charts
This tutorial shows the procedures used to construct a vertical box and whisker plot. In this example, the boxes show medians and upper and lower quartiles of the data, while the whiskers indicate the minimum and maximum values. This tutorial also shows how to add another series representing the means of the data. Horizontal Box and Whisker Charts
This tutorial shows the procedures used to construct a horizontal box and whisker plot. In this example, the boxes show medians and upper and lower quartiles of the data, while the whiskers indicate the minimum and maximum values. This tutorial also shows how to add another series representing the means of the data. Example Box and Whisker ChartsBoxWhisker.zip is a zipped Excel workbook with examples of and step-by-step instructions for constructing vertically and horizontally oriented Box and Whisker plots. PTS Box and Whisker Chart UtilityIn this article I describe techniques for constructing box and whisker charts in Excel. I have also developed the PTS Box and Whisker Chart Utility that allows a user to construct box and whisker charts directly from the raw population data. The utility builds the intermediate summary table and then creates and formats the box plot from this table. This utility is designed to work in Excel for Windows versions 2000 through 2007. The utility has not been tested in any Macintosh version or in Excel 97; it is not expected to work in these versions. The Box and Whisker Chart dialog is shown below:
Read about the PTS Box and Whisker Chart Utility. |
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