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# 14.9. Percentile Constraints and Target Constraints

Applies to: RISKOptimizer in @RISK 5.5–7.x Industrial Edition

While editing constraints in RISKOptimizer, I see two new types of Statistic to Constrain: "Percentile (X for given P)" and "Target (P for given X)". How do these work?

When you choose the "Percentile (X for given P)" statistic, RISKOptimizer constrains the value of the variable (X value) corresponding to a specified cumulative probability value (P value). For example, if P value is set as 0.1 (10%), the 10th percentile is constrained to be within the specified range.

With the "Target (P for given X)" statistic, RISKOptimizer constrains the cumulative probability value (P value) corresponding to a specified value of the variable (X value). For example, if X value is set as 5, and the range between 0.2 and 0.3 is specified, RISKOptimizer requires that the value 5 be between the 20th and 30th percentiles.

Last edited: 2015-07-23