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.
Box and whisker plot quartiles plus#
A far out value is defined as a value that is smaller than the lower quartile minus 3 times the interquartile range, or larger than the upper quartile plus 3 times the interquartile range ( outer fences).An outside value is defined as a value that is smaller than the lower quartile minus 1.5 times the interquartile range, or larger than the upper quartile plus 1.5 times the interquartile range ( inner fences).The horizontal line extends from the minimum to the maximum value, excluding outside and far out values which are displayed as separate 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:
![box and whisker plot quartiles box and whisker plot quartiles](https://i.ytimg.com/vi/mPTo7NHz5og/hqdefault.jpg)
You can choose between vertical and horizontal orientation of the Box-and-Whisker plot.
![box and whisker plot quartiles box and whisker plot quartiles](https://support.content.office.net/en-us/media/96be2fcc-a80d-486c-8575-0ccad1fe0ca8.png)
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.