HOLDOUT Subcommand (ORTHOPLAN command)

HOLDOUT creates holdout cases in addition to the regular plan cases. Holdout cases are judged by the subjects but are not used when CONJOINT estimates utilities.

• If HOLDOUT is not specified, no holdout cases are produced.
• HOLDOUT is followed by a positive integer that is less than or equal to the total number of cases that can be formed from all possible combinations of factor levels.
• Holdout cases are generated from another random plan, not the main-effects experimental plan. The holdout cases will not duplicate the experimental cases or each other.
• The experimental and holdout cases will be randomly mixed in the generated plan or the holdout cases will be listed after the experimental cases, depending on subcommand MIXHOLD. The value of STATUS_ for holdout cases is 1. Any simulation cases will follow the experimental and holdout cases.