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Dot plot

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Creates a dot plot for a single variable with different graph options such as the inclusion of a Bar, Line or Marker for mean or median, with choice of different error bars for mean (95% CI, 1 SEM, 1 SD, 2 SD, 3 SD, range) or median (95% CI, 25-75 percentiles, 10-90 percentiles, 5-95 percentiles, 2.5-97.5 percentiles, 1-99 percentiles, range), and/or Box-and-whisker plot (Tukey, 1977).

Required input

Dialog box for dot plot

Select the variable of interest, and optionally a filter to include only particular cases in the graph.

Several elements can be selected to add onto the dot plot, and some of these can be combined:

Bar, Horizontal Line and/or Marker for mean or median

The following error bars are available if Bars, Horizontal Line and/or Markers is selected:

In a Box-and-Whisker plot, the central box represents the values from the lower to upper quartile (25 to 75 percentile). The middle line represents the median. A line extends from the minimum to the maximum value, excluding "outside" and "far out" values which are displayed as separate points.

Option: if the data require a logarithmic transformation, select the Logarithmic transformation option.


Dot plot

When you click an individual observation in the graph, the corresponding case is displayed in a pop-up window (see also Select variable for case identification command). If you double-click an observation, the spreadsheet window will open with the corresponding case highlighted.

Click Info on the context menu that appears after right-clicking in the graph window to get detailed information on the data represented in the graph (sample size, etc).


See also

Recommended book

Book cover

Exploratory Data Analysis
John W. Tukey

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The approach in this introductory book is that of informal study of the data. Methods range from plotting picture-drawing techniques to rather elaborate numerical summaries. Several of the methods are the original creations of the author, and all can be carried out either with pencil or aided by hand-held calculator.