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Variables Guide

1 • VARIABLES

1 • VARIABLES IDENT—Active entity number. Each entity is given a unique number when created to act as its record of existence. These numbers are reused as entities are disposed and new ones are created. The value returned by IDENT corresponds to the Entity Number argument specified in the entity-related variables in this section. NUMENT—Number of active entities. As each entity is created, NUMENT is increased by one; each disposed entity decreases NUMENT by one. A time-persistent statistic on NUMENT often provides insight into when or whether a model reaches an approximate steady state. If NUMENT increases throughout the run, there may be problems with model logic (for example, leaving entities in a queue) or the input rates of entities to the system may simply be larger than the total output rate possible. Activity area variables Variables are available to obtain the time and/or cost accrued in an activity area. AreaVATime ( Activity Area Name )—Total Value-Added Time. This variable returns the total value-added time accrued for the specified activity area. This represents the total value-added time that was accrued by entities in station logic directly associated with the activity area as well as time rolled up from its child activity area(s). AreaNVATime (ActivityArea Name )—Total Non-Value-Added Time. This variable returns the total non-value-added time accrued for the specified activity area. This represents the total non-valued-added time that was accrued by entities in station logic directly associated with the activity area as well as time rolled up from its child activity area(s). AreaTranTime ( Activity Area Name )—Total Transfer Time. This variable returns the total transfer time that was accrued by entities in station logic directly associated with the activity area as well as time rolled up from its child activity area(s). AreaOtherTime ( Activity Area Name )—Total Other Time. This variable returns the total time categorized as “Other” accrued for the specified activity area. This represents the total other time that was accrued by entities in station logic directly associated with the activity area as well as time rolled up from its child activity area(s). AreaWaitTime ( Activity Area Name )—TotalWait Time. This variable returns the total wait time accrued for the specified activity area. This represents the total wait time that was accrued by entities in station logic directly associated with the activity area as well as time rolled up from its child activity area(s). 9

ARENA VARIABLES USER’S GUIDE AreaTotalTime ( Activity Area Name )—Total Time. This variable returns the total time (the sum of all five time categories) accrued for the specified activity area. This represents the total time that was accrued by entities in station logic directly associated with the activity area as well as time rolled up from its child activity area(s). AreaVACost ( Activity Area Name )—Total Value-Added Cost. This variable returns the total value-added cost accrued for the specified activity area. This represents the total value-added cost that was accrued by entities in station logic directly associated with the activity area as well as cost rolled up from its child activity area(s). AreaNVACost ( Activity Area Name )—Total Non-Value-Added Cost. This variable returns the total non-valued-added cost accrued for the specified activity area. This represents the total non-value-added cost that was accrued by entities in station logic directly associated with the activity area as well as cost rolled up from its child activity area(s). AreaTranCost ( Activity Area Name )—Total Transfer Cost. This variable returns the total transfer cost accrued for the specified activity area. This represents the total transfer cost that was accrued by entities in station logic directly associated with the activity area as well as cost rolled up from its child activity area(s). AreaOtherCost ( Activity Area Name )—Total Other Cost. This variable returns the total cost categorized as “Other” accrued for the specified activity area. This represents the total other cost that was accrued by entities in station logic directly associated with the activity area as well as cost rolled up from its child activity area(s). AreaWaitCost ( Activity Area Name )—Total Wait Cost. This variable returns the total wait cost accrued for the specified activity area. This represents the total wait cost that was accrued by entities in station logic directly associated with the activity area as well as cost rolled up from its child activity area(s). AreaTotalCost ( Activity Area Name )—Total Cost. This variable returns the total cost (the sum of all five cost categories) accrued for the specified activity area. This represents the total cost that was accrued by entities in station logic directly associated with the activity area as well as cost rolled up from its child activity area(s). 10

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