#### AT&T Test Chart

This chart type requires the selection of Feature Variables or Dimension Variables. If the Feature list or Dimension list is displayed in the side bar, this chart icon will be grayed out. Access the Feature Variable or Dimension Variable list in the side bar, and apply some features to the tabbed window to display this chart type.

Sometimes referred to as Western Electric Tests, The AT&T Test Chart contains a series of tests for unnatural patterns that indicate the process may be out of control. AT&T tests are performed on individual observations and ranges and subgroup means and ranges. The following AT&T Tests are available in Datapage+:

Sample Chart

See also:

- Control Tests