Lx is defined as the integration of lx in the interval [x,x+n), where n is the width of the interval. There are many approximations for this. Here we use HMD Method Protocol equation 78. You can think of Lx as lifetable exposure, or person-years lived in each age interval.
ald_to_Lx(ax, lx, dx, nx)numeric vector of Lx values
numeric vector of ax, average time spent in the age interval by those that die in the interval
numeric vector of lx, lifetable survivorship at exact ages.
numeric vector of dx, the lifetable deaths distribution.
age interval width, assumes 1 by default
wilmoth2021methodsLEdecomp