TABLE I.
Title | Formula | |
---|---|---|
Gompertz |
|
|
Weibull |
|
|
Logistic |
|
|
Additional shape-defining parameters |
|
|
Exponential |
|
The tested mortality (μ), functions given age (x), and parameters (b). The Gompertz, Weibull, and logistic functions were all extended by additional shape-defining parameters, the Makeham c term for age independent mortality, and an initial declining Gompertz function with parameters a1 and a2. The exponential function is age-independent and assumes constant mortality with age.