An improved PERT-type formula for standard deviation

An improved PERT-type formula for standard deviation

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Article ID: iaor2002994
Country: United States
Volume: 30
Issue: 3
Start Page Number: 273
End Page Number: 275
Publication Date: Mar 1998
Journal: IIE Transactions
Authors: ,
Abstract:

Recently Keefer and Verdini and Lau et al. showed that well-known PERT-type formulas for computing standard deviation from fractiles are very unreliable, and they presented alternative formulas that are more accurate. This note extends their results and present a formula that is simpler, more meaningful and yet more accurate.

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