单选题：Empirical estimation models are typically based on __.

Empirical estimation models are typically based on __. @[C](1)

A. expert judgement based on past project experiences
B. refinement of expected value estimation
C. regression models derived from historical project data
D. trial and error determination of the parameters and coefficients




A.expert judgement based on past project experiences
B.refinement of expected value estimation
C.regression models derived from historical project data
D.trial and error determination of the parameters and coefficients


答案：C