If the value is an outlier, you can exclude the value or the entire case from further statistical analysis by clicking Exclude on the Tools menu.įor multiple box-and-whisker plots see Multiple comparison graphs and Multiple variables graphs. If you double-click an observation, the spreadsheet window will open with the corresponding case highlighted. When you click an individual observation in the graph, the corresponding case is identified in a pop-up window (see also Select variable for case identification command). This enables you to obtain a diagram representing a statistical summary of the data without the disadvantage of concealing the real data. These values are plotted using a different marker in the warning color (see Format graph).Īs an option, you may select to plot all individual data points.
In the Box-and-whisker plot, the central box represents the values from the lower to upper quartile (25 to 75 percentile). This is the Box-and-Whisker plot for the variable Weight: You can choose between vertical and horizontal orientation of the Box-and-Whisker plot. If the data require a logarithmic transformation, then select the Logarithmic transformation option. The dialog box for Box-and-Whisker plot is similar to the one for Summary statistics: The Box-and-Whisker plot (Tukey, 1977), or boxplot, displays a statistical summary of a variable: median, quartiles, range and possibly extreme values.įor a detailed description of a Box-and-Whisker plot, see Construction of a Box-and-Whisker plot.