The DTREE Procedure

Displayed Output

The SUMMARY statement and the SUMMARY option in an EVALUATE statement cause PROC DTREE to display a optimal decision summary for the decision model. This output is organized into various tables, and they are discussed in order of appearance.

Order of stages

The "Order of stages" table lists all stages, and their types, in order of appearance in the decision model. See the section "The Order of Stages" for details.

For ODS purposes, the label of the "Order of stages" table is "Stages."

Decision Parameters

The "Decision Parameters" table describes the criterion used for determining the optimal decision and the certain equivalent for replacing uncertainties. If you specify the option CRITERION=MAXCE or CRITERION=MINCE in the PROC DTREE statement or in the EVALUATE statement, an additional row is added to the table listing the value of the risk tolerance. It also contains a row showing the value of the optimal decision yields. For additional information, see the section "Evaluation".

For ODS purposes, the label of the "Decision Parameters" table is "Parameters."

Optimal Decision Policy

By default, PROC DTREE produces an "Optimal Decision Policy" table for each decision stages. You can use the TARGET= option to force PROC DTREE to produce only one table for a particular stage. The Alternatives or Outcomes columns list the events in the scenario that leads to the current stage. The Cumulative Reward column lists the rewards accumulated along the scenario to the events of the current target stage. The Evaluating Value column lists the values that can be expected form the events of the target stage. An asterisk (*) is placed beside an evaluating value indicates the current event is the best alternative of the given scenario.

For ODS purposes, the label of the "Optimal Decision Policy" table is "Policy."