On Apr 22, 2012, at 3:41 PM, piltdownpunk wrote:
Hi, all.
I've written a function that returns the survival function for a
Gompertz
mortality model. I've specified the two model parameters. Using a
simple
integration, I can calculate the life expectancy at any age. Is
there a way
I can use a loop with the integration that will quickly return life
expectancy over a range of ages, say 0 to 80, so that I don't have to
manually type in the age in which I'm interested? Please see the code
below.
?Vectorize
(Essentially a wrapper to mapply. No data example so no tested code.)
--
David.
--Trey
hk.bothsex_Gompsurv <- function (t)
{
x=c(0.02342671, 0.05837508)
a3<-x[1]
b3<-x[2]
shift<-15
S.t<-exp(a3/b3*(1-exp(b3*(t-shift))))
return<-S.t
}
integrate(hk.bothsex_Gompsurv,0,Inf)$value/hk.bothsex_Gompsurv(0) #
life
expectancy at birth (change lower limit of integral and
corresponding "t" in
denominator to calculate life expectancy at any age
-----
Trey Batey---Anthropology Instructor
Division of Social Sciences
Mt. Hood Community College
Gresham, OR 97030
Alt. Email: trey.batey[at]mhcc[dot]edu
--
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