Siler: Siler's model mortality for qx and its fitting

In fmsb: Functions for Medical Statistics Book with some Demographic Data

Siler's model mortality for qx and its fitting

Description

Implementing Siler's model mortality function of qx and fitting the model to actual qx of given lifetable.

Usage

 Siler(a1, b1, a2, a3, b3, t)
 fitSiler(initialpar=c(0.01,3,1e-4,1e-5,0.1), data, mode=1, Method="Nelder-Mead", ...)

Arguments

a1	The parameter a1 of the Siler model, q(t)=a1*exp(-b1*t)+a2+a3*exp(b3*t).
b1	The parameter b1 of the Siler model, q(t)=a1*exp(-b1*t)+a2+a3*exp(b3*t).
a2	The parameter a2 of the Siler model, q(t)=a1*exp(-b1*t)+a2+a3*exp(b3*t).
a3	The parameter a3 of the Siler model, q(t)=a1*exp(-b1*t)+a2+a3*exp(b3*t).
b3	The parameter b3 of the Siler model, q(t)=a1*exp(-b1*t)+a2+a3*exp(b3*t).
t	Age (vector OK) in years
initialpar	Initial value for the parameters to be estimated. If not given, c(0.01, 0.0003, 0.07) is used.
data	Actual vector of qx in the lifetable to be used to obtain the best-fit parameters of the Gompertz-Makeham model.
mode	Which of lifetable functions should be used to calculate the RMSE: 1 qx, 2 dx, otherwise lx. Default is 1.
Method	The method to be used in optim() function. Default is "Nelder-Mead".
...	Other options to be passed to optim().

Value

Siler() returns model qx for the same length with t. fitSiler() returns the numeric vector of fitted parameters a1, b1, a2, a3 and b3, RMSE for those values, and the flag of convergence.

Author(s)

Minato Nakazawa [e-mail] https://minato.sip21c.org/

See Also

Jlife

Examples

 res <- fitSiler(,Jlife$qx2005M)
 FLAG <- res[7]
 while (FLAG>0) {
   res <- fitSiler(res[1:5], Jlife$qx2005M)
   FLAG <- res[7]
 }
 print(res)

fmsb documentation built on May 29, 2024, 2:02 a.m.