This is a common approximation of lifetable exposure: All persons surviving to the end of the interval time the interval width, plus all those that died in the interval multiplied by their average time spent in the interval.

lt_id_lda_L(lx, ndx, nax, AgeInt)

## Arguments

lx numeric. Vector of age-specific lifetable survivorship. numeric. Vector of lifetable deaths, summing to radix of lx. numeric. Vector of average time spent in interval by those dying in interval. integer. Vector of age class widths.

## Value

nLx numeric vector of lifetable exposure.

## Details

There is no checking of equal vector lengths at this time.

## References

Preston S, Heuveline P, Guillot M (2000). Demography: measuring and modeling population processes. Wiley-Blackwell.