Lift

The lift graph displays at least three lines:

• A line showing the lift for each model

• A red line for the random model

• A vertical blue line for threshold

The x-axis of the graph is divided into quantiles. The graph shows the lift from the model (or models) and also shows the lift from a naive model (Random) and the ideal lift.

The Lift viewer compares lift results for a given target value in two or more models. It displays either the Cumulative Positive Cases or the Cumulative Lift.

If you are comparing the lift for two or more models, then the lines for different models are in different colors. The table below the graph shows the name of the model and the color used to display results for that model.

The viewer has the following controls:

• Display: Selects the display option, either Cumulative Positive Cases (default) or Cumulative Lift.

• Target Value: Selects the target value for comparison. The default target value is the least frequently occurring target value.

The threshold is a blue vertical line used to select a quantile. As the threshold moves, the details for each test result in the Lift Detail table changes to the point on the Lift Chart that corresponds to the selected quantile. You move the threshold by dragging the indicator on the quantile line. Here is the quantile set to 20:

Description of the illustration quantileline.gif

Below the graph, a data table supplements the information presented in the graph. You can minimize the table using the splitter line.

The table has the following columns:

• Name, the name of the model along with color of the model in the graph

• Lift Cumulative

• Gain Cumulative Percentage

• Percentage Records Cumulative

• Target Density Cumulative

• Algorithm

• Creation Date (date and time)

Above the Models grid is the Lift Detail Dialog icon . Select a model and click the icon to open the Lift Detail dialog box, which displays lift details for 100 quantiles.

To change the list of models, click and deselect any models for which you do not want to see results. If you deselect a model, then both the lift curve and the detail information for that model are not displayed. By default, results for all models in the node are displayed.