Defense Acquisition Research Journal #108

Distribution Comparisons of EAC Cost Growth

FIGURE 4. WEIBULL FIT TO WBS ST&E COST GROWTHS AIC = 145.37

Histogram of Data Rayleigh Distribution

0.8

0.5

0.4

0.2

0.0

0 1

2

3 4 5 6 7

Note. AIC = Akaike Information Criterion; ST&E = System Test and Evaluation; WBS = Work Breakdown Structure.

FIGURE 5. QUANTILE-QUANTILE PLOTS (LEFT: LOGNORMAL; RIGHT: WEIBULL) FOR COST WBS

QQ Plot

QQ Plot

6

6

5

5

4

4

3

3

2

2

1

1

0

1

2

3 4 5 6

0 1

2 3 4 5 6 Fitted Quantile

Fitted Quantile

Note. WBS = Work Breakdown Structure.

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Defense ARJ , Spring 2025, Vol. 32 No. 1

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