Kannisto-Thatcher model in probability of death space

$$ q_x = 1 - (\frac{\alpha * \exp(\beta x) + 1}{\alpha * \exp(\beta * (x+5)) + 1})^{1/\beta} $$

Usage

model_kt_qx(x, params)

Arguments

x

age group start

params

numeric(2) vector of Kannisto-Thatcher model parameters \(\alpha\) (a) and \(\beta\) (b).

Value

Prediction of Kannisto-Thatcher model at age x