On a direct estimator for average production intervals

Research output: Contribution to journalArticlepeer-review


Nozari and Whitt proposed an indirect approach to estimating the average production interval (i.e., the length of time between starting and finishing work on each good or defect-free product), based on measurements of the work-in-process inventory and the production rate. A necessary and sufficient condition for the consistency or validity of their estimator is derived herein. Our validity condition also yields an alternate estimator for the average production interval; as a direct estimator, it has better asymptotic efficiency than the indirect estimator.

Original languageEnglish (US)
Pages (from-to)41-47
Number of pages7
JournalOperations Research Letters
Issue number1
StatePublished - Aug 1995
Externally publishedYes


  • Applications
  • Average production intervals
  • Direct and indirect estimations
  • Networks
  • Queues

ASJC Scopus subject areas

  • Software
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering
  • Applied Mathematics
  • Statistics, Probability and Uncertainty
  • Discrete Mathematics and Combinatorics
  • Modeling and Simulation


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