About project lines

Project lines join each data point to its base so that you can see precisely where data points fall along the axis and compare data points to a reference value. You can add project lines to scatterplots, matrixplots, histograms, time series plots, 3D scatterplots, and 3D surface plots.

Examples

Show position relative to an axis

This example shows where the data points fall along the x-axis. If you want to discern where points fall on the y-axis, change the projection direction.

Show distance from a target

This example shows how far data points extend from a target of 2.5. If you want to evaluate a different target value, change the base position.

Add project lines to a graph

You can add project lines to scatterplots, matrixplots, histograms, time series plots, 3D scatterplots, and 3D surface plots.

  • To add project lines when you create a graph: in the dialog box for the graph you are creating, click Data View. On the Data Display tab, select Project Lines.
  • To add project lines to an existing graph: right-click the graph and choose Add > Data Display. Select Project lines.

Change the projection direction of project lines

The projection direction is the direction in which the project lines extend on the graph. By default, the direction is toward the x-axis, or the xy-plane for 3D graphs. However, you can change the projection direction to discern where points fall on the y-axis.

  1. Double-click a project line and click the Options tab.
  2. Under Projection Direction, choose one of the following:
    Toward X Scale
    Toward Y Scale
  3. Click OK.

Change the base position of project lines

The base position is the value from which project lines originate. Graphed values greater than the base position project up from the line; graphed values less than the base position project down from the line.

Base position = 0
Base position = 350
Example of changing the base position

In the example, the base position of the time series plot was changed from 0 to 350, which corresponds to a sales goal. You can see how far away each point is in either direction from the sales goal.

  1. Double-click a project line and click the Options tab.
  2. Under Base Position, click Custom and enter a value for the base position.
  3. Click OK.
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