As illustrated by the table in
Rule 1 Expected Outcome, rule 1 (the age rule) is really a combination of two
sub-rules; we specified an age value for the first Condition but did not specify a smoker value for the second Condition. Because the smoker Condition has two possible values (
true and
false), the two sub-rules can be stated as follows:
Corticon Studio makes it easy to view sub-rules for any or all columns in a Rulesheet. By clicking the
Expand Rules 
button on the toolbar, or simply double-clicking the column header,
Corticon Studio will display sub-rules for any selected column. If no columns are selected, then all sub-rules for all columns will be shown. Sub-rules are labeled using Decimal numbers: rule 1 below has two sub-rules labeled 1.1 and 1.2. Sub-rules 1.1 and 1.2 are equivalent to the upper left and upper right cells in
Rule 1 Expected Outcome.
As we pointed out before, the outcome is the same for each sub-rule. Because of this, the sub-rules can be summarized as the general rules shown in column 1 of
Simple Rules for Profiling Insurance Policy Applicants. We also say that the two sub-rules collapse into the rules shown in column 1. The 'dash' symbol in the smoker value of column 1 indicates that the actual value of smoker does not matter to the execution of the rule – it will assign
riskRating the value of
low no matter what the smoker value is (as long as
age <= 55, satisfying the first Condition). Looking at it a different way, only those rules with dashes in their columns have sub-rules, one for each value in the complete value set determined for that Condition row.
