Computes survival over n years starting at age x0 in year
issue_year, using base-year mortality qx_base_vec and
improvement factors AAx_vec.
Usage
tpx_improved(x0, n, qx_base_vec, AAx_vec, base_year, issue_year)
Arguments
- x0
Issue age.
- n
Number of years.
- qx_base_vec
Base-year one-year death probabilities for successive ages.
- AAx_vec
Mortality improvement factors for successive ages.
- base_year
Base year.
- issue_year
Issue year.
Details
The vectors should correspond to ages
x0, x0+1, ..., x0+n-1.
The survival probability is
$$\prod_{j=0}^{n-1} \left(1 - q_{x+j}^{[issue\_year+j]}\right)$$.