Box Plot

The view can be accessed either via the “Open view” action on the executed node or on KNIME Hub.
In the node configuration, you can enable certain controls, which are then available in the view. This includes the ability to choose different dimension columns and a condition column or the possibility to set a title.
The configuration also offers a preview of the view, which should help to get the box plot in the desired shape quickly.

A box plot is constructed in the following way: The box itself goes from the lower quartile (Q1) to the upper quartile (Q3). The median is drawn as a horizontal bar inside the box. The distance between Q1 and Q3 is called the interquartile range (IQR).
Above and below the box are the so-called whiskers. They are drawn at the minimum and the maximum value as horizontal bars and are connected with the box with a line. The whiskers never exceed 1.5 * IQR. This means if there are some data points which exceed either Q1 - (1.5 * IQR) or Q3 + (1.5 * IQR) than the whiskers are drawn at exactly these ranges and the data points are drawn separately as outliers.

Since missing values as well as NaN (not a number) cannot be displayed in the view, they will be omitted.

Options

Dimension columns

Select the columns with numerical values for which you wish to plot boxes. Note: Missing and NaN (not a number) values in a dimension column will be ignored with a corresponding warning message. If all values from which a box is computed are missing or NaN, the box will be excluded from the view and a warning message will be raised.

Condition column

Select a column with respect to which a conditional box plot should be created. The values of the selected column are treated as categories. For each of these categories there is one box (indicated by color) within each of the dimensions. Note: Missing values are treated as a separate category.

Title

The title of the graph shown above the generated image. If left blank, no title will be shown.

Value axis limits

Choose if the axis range of the value axis should be calculated automatically by the charting framework, taken from the domain range or set manually. You might need to use a Domain Calculator or Edit Numeric Domain node before this node.

Value axis min

Value that sets the vertical axis minimum.

Value axis max

Value that sets the vertical axis maximum.

Dimension axis label

The label used for the horizontal dimension axis. If left blank, no label will be shown.

Value axis label

The label used for the vertical value axis. If left blank, no label will be shown.

Display legend

When checked, the chart’s legend containing the categories of the condition column is displayed.

Enable image download

When checked, an image of the chart can be downloaded by clicking the image download button in the view.

Show tooltip

When checked, hovering over a box will show information about the data.

Enable animation

When checked, the animation of the graph is active.

Generate image

If checked, adds an image output port and, upon execution, generates a PNG image which is made available via this port.

Width

The width of the generated image (in pixels).

Height

The height of the generated image (in pixels).

Views

Box Plot

A box plot visualization of the input data.

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