The Gompertz model in 'flexsurv' is
Notice that
pdf = mortality rate * s (based on mortality definition)
m = - 1/s ds/dt , so - ds/dt = pdf = m * s
So, flexsurv-shape a ==G, flexsurv rate b = R.
Inverse of Gompertz CDF:
Tuesday, June 25, 2013
*** Two-parameter Gompertz model
Median lifespan of the 2-parameter
Survivorship
The Gompertz model in 'flexsurv' is
Notice thatpdf = mortality rate * (1-s)
pdf = mortality rate * s (based on mortality definition)
m = - 1/s ds/dt , so - ds/dt = pdf = m * s
So, flexsurv-shape a ==G, flexsurv rate b = R.
Inverse of Gompertz CDF:
The Gompertz model in 'flexsurv' is
Notice that
pdf = mortality rate * s (based on mortality definition)
m = - 1/s ds/dt , so - ds/dt = pdf = m * s
So, flexsurv-shape a ==G, flexsurv rate b = R.
Inverse of Gompertz CDF:
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