page 43, two parameter Gompertz model
page 44, Gompertz-Makeham model
Quadratic form of Gompertz-Makeham model, El Shaarawi et al 1974
u(t) = M + R exp( at + bt^2)
Logistic equations like the Perks equation, which can be derived from GG91's avalanche-like aging model.
Weibull model (1951): u(t) = B * t^c
page 46, GG91's generalized bionomial mortality model:
u(t) = A + (b + c t)^n
GG91 argues that when b >>c, bionomial model lead to R=b^n, G=nc/b
When b<<c, it is the Weibull model.
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