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Data Collection for Simulation

Data Collection for Simulation. Sources of Data. Computer Files Database Spreadsheets Raw Data Video Records Hard Copy Files & Documents Interviews. Video Observation of running system Interviews. Existing. Observation. When & How Much to Collect?. To help design model Interviews

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Data Collection for Simulation

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  1. Data Collectionfor Simulation

  2. Sources of Data • Computer Files • Database • Spreadsheets • Raw Data • Video Records • Hard Copy Files & Documents • Interviews • Video • Observation of running system • Interviews Existing Observation

  3. When & How Much to Collect? • To help design model • Interviews • Observation • Minimum necessary • To obtain input parameters • Adequate amount for statistical tests Preliminary Detailed

  4. What to collect? • Data to Determine • Layout of system • Entities of importance • Flow of entities • Problems • Rough estimates of times • Data for • Arrivals • Services • Queues • Anomalies Preliminary Detailed

  5. What to collect? More… • Focus on data related to problems & objectives • Enough data for statistical significance • Continuous data

  6. Collection Schedule Depends on Simulation Objectives & Level of Activity • Days of week • Busiest, Typical, Slowest • All, Certain ones • Time of day • Busiest, Typical, Slowest • Start-up, Wind-down • Length of time • Adequate numbers

  7. How Many Collectors? • Minimum of 2 collectors for each major entity • One watches & times; One records • Factors • Level of Activity • Proximity of areas to be observed • Visibility

  8. Collection Guidelines Collectors can have NO Effect on the system! • Should be located “outside” the system • Cannot utilize any resource • Never interfere • Best if not seen

  9. Collection Process • Collect information necessary to reproduce system activity • NOTE: That is not everything!! • Example: Single Queue & Server System • Arrival Time, Begin Service, End Service • Allows calculation of all remaining values of interest. How? • Time Units • Smallest necessary (seconds, minutes…)

  10. Sample Collection FormSingle Queue-Single Server Comments??

  11. Data Collection Plan • A description of process that includes • Method(s) for collection • Timeline for data collection process & completion • List of data items to be collected • Number of collectors • Dates & times of actual data collected (if not observed in real-time) • Justification for each of the above • Diagrams as necessary

  12. Data Collection Report • A description of completed collection process that includes • Restatement of “Plan” & any changes to original plan • Results of Statistical Analysis of data • Graphs, Averages, Max, Min • Summary of results • Relation of results to clients objectives • Recommendations • Diagrams as necessary

  13. Data Collection Assignment • Select System • Design & Write Data Collection Plan • Observe & Collect • Complete Data Analysis • Write Data Collection Report

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