New validations of PERT times

This paper defends the classical PERT formulas for computing the mean and variance of the random activity time. We show three new validations for them by examining the kurtosis of the beta distribution employed in PERT.

[1]  T. K. Littlefield,et al.  PERT Duration Times: Mathematics or MBO , 1991 .

[2]  Frank E. Grubbs.  Letter to the Editor---Attempts to Validate Certain PERT Statistics or “Picking on PERT” , 1962 .

[3]  K. C. Chae.  A geometric interpretation of the PERT assumptions on the activity time , 1990 .

[4]  D. Keefer,et al.  Better estimation of PERT activity time parameters , 1993 .

[5]  Hon-Shiang Lau,et al.  A proposal on improved procedures for estimating task-time distributions in PERT , 1995 .

[6]  D Sculli,et al.  A historical note on PERT times , 1989 .

[7]  Terence Williams.  What are PERT Estimates? , 1995 .

[8]  Charles A. Gallagher,et al.  Reply-A Note on PERT Assumptions , 1987 .

[9]  T. K. Littlefield,et al.  Reply-An Answer to Sasieni's Question on PERT Times , 1987 .

[10]  M W Sasieni,et al.  A note on PERT times , 1986 .

[11]  Genaro J. Gutierrez,et al.  Parkinson's Law and Its Implications for Project Management , 1991 .

[12]  N. L. Johnson,et al.  Continuous Univariate Distributions. , 1995 .

[13]  K. MacCrimmon,et al.  An Analytical Study of the PERT Assumptions , 1964 .

[14]  Nicholas R. Farnum,et al.  Some Results Concerning the Estimation of Beta Distribution Parameters in PERT , 1987 .

[15]  D. Golenko-Ginzburg.  On the Distribution of Activity Time in PERT , 1988 .

[16]  Kyung-Chul Chae,et al.  Estimating the Mean and Variance of PERT Activity Time Using Likelihood-Ratio of the Mode and the Midpoint , 1990 .

[17]  Salah E. Elmaghraby,et al.  Activity networks: Project planning and control by network models , 1977 .

[18]  Charles E. Clark,et al.  Letter to the Editor—The PERT Model for the Distribution of an Activity Time , 1962 .

[19]  Lloyd A. Swanson,et al.  IMPLICATIONS OF THE UNDERLYING ASSUMPTIONS OF PERT , 1971 .

[20]  D. Malcolm,et al.  Application of a Technique for Research and Development Program Evaluation , 1959 .

[21]  D Golenko-Ginzburg,et al.  PERT assumptions revisited , 1989 .

[22]  Soumyo Moitra,et al.  Skewness and the Beta Distribution , 1990 .