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 "The Order of Stages" section
For ODS purposes, the label of the
"Order of stages" table is "Stages."
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=MINCE in the
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 "Evaluation" section.
For ODS purposes, the label of the "Decision Parameters" table
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
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.