VARIABLES
/ options ;
The VARIABLES statement specifies the variable lists in the input data sets. This statement is optional but if it is used, it must appear immediately after the PROC DTREE statement. The options that can appear in the VARIABLES statement are divided into groups according to the data set in which they occur. Table 7.11 lists all the variables or variable lists associated with each input data set and their types. It also lists the default variables if they are not specified in this statement.
Table 7.11: Input Data Sets and Their Associated Variables
Data Set 
Variable 
Type 
Interpretation 
Default 
STAGEIN= 
C/N 
Outcome names 
Variables with prefix _OUT 

N 
Instant reward 
Variables with prefix _REW 

C/N 
Stage name 
_STNAME_ 

as STAGE= 
Immediate successors 
Variables with prefix _SUCC 

C/N 
Stage type 
_STTYPE_ 

C 
HTML page for the stage 

PROBIN= 
as OUTCOME= 
Event names 
Variables with prefix _EVEN 

as OUTCOME= 
Names of given outcomes 
Variables with prefix _GIVE 

N 
Conditional probabilities 
Variables with prefix _PROB 

PAYOFFS= 
as OUTCOME= 
Action names of final decision 
Variables with prefix _ACT 

as OUTCOME= 
Outcome names 
Variables with prefix _STAT 

N 
Values of the scenario 
Variables with prefix _VALU 
'C' denotes character, 'N' denotes numeric, 'C/N' denotes character or numeric, and 'as X' denotes the same as variable X.
The following options specify the variables or variable lists in the STAGEIN= input data set that identify the stage name, its type, its outcomes, and the reward; and the immediate successor of each outcome for each stage in the decision model:
The following options specify the variables or variable lists in the PROBIN= input data set that identify the given outcome names, the event (outcome) name, and the conditional probability for each outcome of a chance stage.
The following options specify the variables or variable lists in the PAYOFFS= input data set that identify the possible scenarios (a sequence of outcomes), the final outcome names, and the evaluating values (payoff) of combinations of scenarios and final outcomes.