|The DTREE Procedure|
The VPI statement causes PROC DTREE to compute the value of perfect information. The value of perfect information is the benefit of resolving an uncertain stage before making a decision. This value is the upper limit on the improvement that can be expected for any information gathering effort. Only the name of a chance stage can be used to calculate the value of perfect information. The procedure evaluates the decision tree, if it has not already done so, before computing this value.
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