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The Estimation of the Mean and Variance of a “PERT” Activity Time

Author

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  • William A. Donaldson

    (Department of Industrial Administration, University of Strathclyde, Glasgow, C. 1, Scotland)

Abstract

An alternative method of estimating the variance of a PERT activity time is proposed given that one of the initial estimates is the mean. The beta-distribution of the activity time is assumed to be tangential to the x -axis at each end. Restrictions in the current method are relaxed, and the inconsistency of the implicit assumption of a fixed coefficient of skew removed. The skew of the distribution is determined by the three estimates of the activity time. No difficult computations are involved.

Suggested Citation

  • William A. Donaldson, 1965. "The Estimation of the Mean and Variance of a “PERT” Activity Time," Operations Research, INFORMS, vol. 13(3), pages 382-385, June.
    • Handle: RePEc:inm:oropre:v:13:y:1965:i:3:p:382-385
    DOI: 10.1287/opre.13.3.382
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    Cited by:

    1. Zichong Lyu & Dirk Pons & Yilei Zhang, 2023. "Emissions and Total Cost of Ownership for Diesel and Battery Electric Freight Pickup and Delivery Trucks in New Zealand: Implications for Transition," Sustainability, MDPI, vol. 15(10), pages 1-23, May.

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