Rockwell Automation Arena OptQuest Users Guide - Manual (Page 43)

4 • S ETTING U P AND O PTIMIZING A M ODEL
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R UN M ORE R EPLICATIONS
You can run additional replications on the top n solutions. With this feature, you can run
an initial optimization specifying a small number of replications. You can then run more
replications on the best solutions. Additional replications may change the objective value,
which may change the best solution.
To run more replications, click the Run more replications option button. Enter the
number of additional replications you want to run. If your initial optimization used a
varying number of replications, both the minimum number of replications and the
maximum number of replications will be incremented by the amount you entered. Specify
how many solutions you want in the set of solutions by entering a count. The top “count”
solutions will be evaluated.
When the optimization is run with this refinement selected, the progress of the additional
replications is shown in a replication summary grid that replaces the original optimization
progress display. While the additional replications are being run, the row for the current
solution is highlighted and you will see the replication counter increment.
R UN R ANK AND S ELECT
Rank and Select is a sophisticated algorithm that runs more replications of solutions to
further refine the list of best solutions. The Rank and Select algorithm eliminates solutions
from a set of solutions until there is a defined percentage chance that the remaining solu-
tions are at most the indifference zone value from the true best in the candidate list.
To run Rank and Select, click the Run Rank and Select option button. Enter the
maximum number of replications to be run by Rank and Select and specify how many
solutions you want in the set of solutions by entering a count. The top “count” solutions
will be in the Rank and Select solution set. Finally, set the Indifference Zone and the
probability.
When the optimization is run with the Run Rank and Select option chosen, the progress of
the Rank and Select algorithm is shown in a Rank and Select summary grid that replaces
the original optimization progress display.