On a direct estimator for average production intervals

Research output: Contribution to journalArticle


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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