# Pmp Formulas

**Topics:**Net present value, Cost-benefit analysis, Depreciation

**Pages:**3 (613 words)

**Published:**July 5, 2011

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Earned Value

CV = EV - AC CPI = EV / AC SV = EV - PV SPI = EV / PV EAC ‘no variances’ = BAC / CPI EAC ‘fundamentally flawed’ = AC + ETC EAC ‘atypical’ = AC + BAC - EV EAC ‘typical’ = AC + ((BAC - EV) / CPI) ETC = EAC - AC ETC ‘atypical’ = BAC - EV ETC ‘typical’ = (BAC - EV) / CPI ETC ‘flawed’ = new estimate Percent Complete = EV / BAC * 100 VAC = BAC - EAC EV = % complete * BAC

Mathematical Basics

Average (Mean) = Sum of all members divided by the number of items. Median = Arrange values from lowest value to highest. Pick the middle one. If there is an even number of values, calculate the mean of the two middle values. Mode = Find the value in a data set that occurs most often.

Values

1 sigma = 68.26% 2 sigma = 95.46% 3 sigma = 99.73% 6 sigma = 99.99% Control Limits = 3 sigma from mean Control Specifications = Defined by customer; looser than the control limits Order of Magnitude estimate = -25% to +75% Preliminary estimate = -15% to + 50% Budget estimate = -10% to +25% Definitive estimate = -5% to +10% Final estimate = 0% Float on the critical path = 0 days Pareto Diagram = 80/20 Time a PM spends communicating = 90% Crashing a project = Crash least expensive tasks on critical path. JIT inventory = 0% (or very close to 0%.) Minus 100 = (100) or -100

PERT

PERT 3-point = (Pessimistic+(4*Most Likely)+Optimistic)/6 PERT σ = (Pessimistic - Optimistic) / 6 PERT Activity Variance = ((Pessimistic - Optimistic) / 6)^2 PERT Variance all activities = √sum((Pessimistic - Optimistic) / 6)^2

Network Diagram

Activity Duration = EF - ES + 1 or Activity Duration = LF - LS + 1 Total Float = LS - ES or Total Float = LF – EF Free Float = ES of Following - ES of Present - DUR of Present EF = ES + duration - 1 ES = EF of predecessor + 1 LF = LS of successor - 1 LS = LF - duration + 1

Acronyms Project Selection

PV = FV / (1+r)^n FV = PV * (1+r)^n NPV = Formula not required. Select biggest...

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