Model Browser User's Guide

Verifying the Model

Verifying the Local Model

The first step is to check that the local models agree well with the data.

1. Select PS22 (the local node) on the Model Browser tree.

   

1. The Local Model pane appears, displaying the local model fitting the torque/spark data for the first test and diagnostic statistics that describe the fit. The display is flexible in that you can drag, open, and close the divider bars separating the regions of the screen to adjust the view.

   

The lower plot shows the data being fitted by the model (blue dots) and the model itself (line). The red spot shows the position of the polyspline knot, at the datum (maximum) point.

2. In the upper scatter plot pane, click the y-axis factor pop-up menu and select Studentized residuals.
3. To display plots and statistics for the other test data, scroll through the tests using the Test arrows at the top left, or by using the Select Test button.
4. Select Test 588. You see a data point outlined in red. This point has automatically been flagged as an outlier.
5. Right-click the scatter plot and select Remove Outliers.

Both plots have right-click pop-up menus offering various options such as removing and restoring outliers and confidence intervals. Clicking any data point marks it in red as an outlier.

You can use the Test Notes pane to record information on particular tests. Each test has its own notes pane. Data points with notes recorded against them are colored in the global model plots, and you can choose the color using the Test Number Color button in the Test Notes pane.

Specifying the Response Model

Verifying the Global Model