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Dot plot

Command:Statistics
Next selectDistribution plot
Next selectDot plot

Description

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.

Example

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 menu command). If you double-click an observation, the spreadsheet window will open with the corresponding case highlighted.

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

Literature

See also