Cost

The Cost tab of Tune Settings allows you to specify costs for target for scoring purposes. For basic information, see Cost.

By default the cost matrix is initially generated based on all the known target values in the build data source. The cost matrix is set to cost values of 1 to start with.

Follow these steps to specify costs:

  1. In the Property Inspector for the build node, go to the Models tab. Select the model that you want to tune and click tune selected model

    Select Tune from the menu. The Tune Settings dialog opens in a new tab. In Tune Settings, go to the Cost tab.

  2. Select the target value for which to specify costs.

  3. Decide which is most important:

    • Incorrectly identifying a case as a target class; that is, i a False Positive

    • Incorrectly identifying a case as a non-target class; that is, a False Negative.

    False Positive is the default. Click the correct radio button.

  4. Specify a weight that for the cost.

  5. Click Apply to add the cost that you just specified to the cost matrix.

  6. Define costs for all target values that you are concerned about.

  7. To apply the matrix, click Tune in the right-hand column.

  8. Click Derived Matrix to view the Cost Matrix that you created.

Examine the Derived Cost Matrix. You can continue tuning by changing any selections that you made.

To cancel the tuning, click Reset. Tuning returns to Automatic.

When you done tuning, either click OK to accept the tuning or Cancel to cancel.

To see the impact of the tuning, re- the model node.