Box Plots

Box plot and notched box plot orientation cannot be changed after the plot is created. You must delete the existing plot and create the desired plot to change the box plot orientation, e.g. from Vertical Box Plot to Horizontal Box Plot.

The caps, or whiskers, at the end of each box indicate the extreme values (minimum and maximum, inter-quartile range times a factor, or a percentage of the data), the box is defined by the lower and upper quartiles, and the line in the center of the box is the median. The values are sorted before referencing.

Box plots show extreme values, median, lower quartile,

and upper quartile information for groups of data.

In addition, the box plot options let you display symbols for each of the outlier samples in your data group. The definitions of these terms are:

Term	Definition
Median	For an odd number of data points, this is the middle value. For an even number points, it is the mean of the middle values.
First Quartile	Value[(0.25 x (number of data points) + 0.5, rounded off to nearest whole number]
Third Quartile	Value[0.75 x (number of data points) + 0.5, rounded off to nearest whole number]

Creating a New Box Plot

To create a 2D box-whisker plot:

Click the Home | New Graph | Statistical command and then click Vertical Box Plot, Notched Vertical Box Plot, Horizontal Box Plot, Notched Horizontal Box Plot.
Select a data file in the Open Worksheet dialog. You can select a new data file or you can select an open data file in the Open worksheets section.
Click the Open button. A box-whisker plot is created using the default properties.

Editing Box Plot Properties

To change the features of a box-whisker plot, including the columns used to create the plot, first select the box plot in the plot window or Object Manager and then edit its properties in the Property Manager.

Click the following tabs in the Property Manager to change different properties:

Box Plots

Creating a New Box Plot

Editing Box Plot Properties

See Also