Communications (how many people in a communications network)
N = (n (n - 1)) / 2
Present value (PV)
PV = (FV / (1 + r)n)
where
- FV = Future value in $
- r = Discount rate percentage expressed as a decimal number (i.e. 10% = 0.1)
- n = The time period (i.e. 5 years)
Net present value (NPV)
- NPV = Initial outlay + the sum of all subsequent present value calculations
Earned value management
- Planned value (PV) = Time % complete x BAC
- Earned value (EV) = PV x % complete
- Schedule variance (SV) = EV - PV
- Schedule performance index (SPI) = EV / PV
- Cost variance (CV) = EV - AC
- Cost performance index (CPI) = EV / AC
Estimate at completion (EAC) - 1 of 4 formulae
- EAC = BAC / CPI
- EAC = AC + ETC
- EAC = AC + (BAC - EV)
- EAC = AC + ((BAC - EV) / (CPI x SPI))
Estimate to complete (ETC) = EAC - AC
Variance at completion (VAC) = BAC - EAC
To Complete Performance Index (TCPI)
- TCPI = (BAC - EV) / (BAC - AC) if you are aiming for BAC
- TCPI = (BAC - EV) / (EAC - AC) if you are aiming for EAC
Three-point estimating from PERT (Program Evaluation and Review
Technique
)
Three-point estimate = (O + (M x 4) + P) / 6
where
- O = Optimistic
- M = Most likely (sometimes appears as an R for Realistic)
- P = Pessimistic
- Standard deviation = (P - O) / 6
- Variance = ((P - O) / 6)2
Point of total assumption (PTA)
PTA = Target cost + ((ceiling price - target price) / buyers % share of cost overruns))