Question

Which estimating technique uses a statistical relationship to calculate cost or duration based on historical data and other project parameters?

Answer 1

Parametric estimation is a  techniques that uses a statistical relationship to calculate cost or duration based on historical data and other project parameters

Parametric estimation is a quantitative method (statisitical relationship) used to estimate the project cost, resources, and duration based on historical data and other project parameters.

Parametric estimation models are used when:

1. There is precedent
2. The model is a unit hence can be scaled up
3. The parameters required are easily quantifiable

While the other options of this question is incorrect because:

b. grass roots estimating

Cost estimation done by the individuals who will be performing the task being estimated.

c. empirical estimating

Estimation method in which the data is obtained using empirical formulas. It is usually based on an amalgamation of historical data, assumptions, guesses, and personal experience.  

d. analogous estimating

Also called top-down estimating, this is a technique that involves comparing previous projects, personal experiences and cursory cross-referencing observed costs to estimate time resources required. This technique is most useful in the absence of quantifiable data.

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