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Data Collection for Simulation - cs.msutexas.edu

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Data Collectionfor Simulation
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Sources of Data
Existing
Observation
Computer FilesDatabaseSpreadsheetsRaw DataVideo RecordsHard Copy Files & DocumentsInterviews
VideoObservation of running systemInterviews
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When & How Much to Collect?
Preliminary
Detailed
To help design modelInterviewsObservationMinimum necessary
To obtain input parametersAdequate amount for statistical tests
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What to collect?
Preliminary
Detailed
Data to DetermineLayout of systemEntities of importanceFlow of entitiesProblemsRough estimates of times
Data forArrivalsServicesQueuesAnomalies
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Focus on data related to problems & objectivesEnough data for statistical significanceContinuous data
What to collect? More…
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Depends on Simulation Objectives & Level of ActivityDays of weekBusiest, Typical, SlowestAll, Certain onesTime of dayBusiest, Typical, SlowestStart-up, Wind-downLength of timeAdequate numbers
Collection Schedule
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Minimum of 2 collectors for each major entityOne watches & times; One recordsFactorsLevel of ActivityProximity of areas to be observedVisibility
How Many Collectors?
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Collectors can have NO Effect on the system!Should be located “outside” the systemCannot utilize any resourceNever interfereBest if not seen
Collection Guidelines
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Collect information necessary to reproduce system activityNOTE: That is not everything!!Example: Single Queue & Server SystemArrival Time, Begin Service, End ServiceAllows calculation of all remaining values of interest. How?Time UnitsSmallest necessary (seconds, minutes…)
Collection Process
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Sample Collection FormSingle Queue-Single Server
Comments??
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A description of process that includesMethod(s) for collectionTimeline for data collection process & completionList of data items to be collectedNumber of collectorsDates & times of actual data collected (if not observed in real-time)Justification for each of the aboveDiagrams as necessary
Data Collection Plan
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A description of completed collection process that includesRestatement of “Plan” & any changes to original planResults of Statistical Analysis of dataGraphs, Averages, Max, MinSummary of resultsRelation of results to clients objectivesRecommendationsDiagrams as necessary
Data Collection Report
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Select SystemDesign & Write Data Collection PlanObserve & CollectComplete Data AnalysisWrite Data Collection Report
Data Collection Assignment
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Data Collection for Simulation - cs.msutexas.edu