Viewing LSL, USL, and Target Marker Lines

By default, after you add specification limits and a target to a forecast, markers for these values are displayed on the forecast chart. For an example, see Figure 190, Frequency and Cumulative Frequency Charts with Capability Metrics and Statistics in Split View.

Notice that the certainty range on the forecast chart changes to match the LSL and USL values. The certainty indicates the probability of falling within those specification limits. To show the certainty of different values, type them into the Minimum and Maximum fields or click the certainty grabbers and drag them to a new position.

  To add specification limit and target marker lines manually or to remove them:

  1. Choose Preferences, then Chart Preferences in a forecast chart window, or double-click the chart.

  2. Click the Chart Type tab in the Chart Preferences dialog.

  3. Scroll down to the bottom of the Marker Lines list.

  4. Be sure LSL, USL, Target is checked to display the specification limit and target marker lines on that forecast chart.

    To hide the markers, uncheck LSL, USL, Target.

  5. When all settings are complete, click OK.

Notice that you can display the mean and other marker lines in addition to the specification limit and target markers.