Variability analysis of traffic simulation outputs: practical approach for TRAF-NETSIM

Rahim F Benekohal, Ghassan Abu-Lebdeh

Research output: Contribution to journalArticlepeer-review


The variability of NETSIM's output using the methods of replication and batch means was explored. For the batch means method, it is proposed to compute the measures of effectiveness (MOEs) for intermediate time intervals using a proposed interval calculation (PIC) procedure. Depending on the MOE and level of aggregation, the two methods yielded significantly different results. Either the batch means with PIC method or replication method must be used to build confidence intervals. NETSIM's direct output for intermediate time intervals should not be used to build a confidence interval unless an autocorrelation analysis is done. Not using proper statistical procedures can lead to erroneous and misleading conclusions.

Original languageEnglish (US)
Pages (from-to)198-207
Number of pages10
JournalTransportation Research Record
Issue number1457
StatePublished - Dec 1994

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanical Engineering


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