Compute Age-Based Indicator

Compute ABI (Griffiths et al. 2023) given a population age structure and an age structure to use as a reference.

Usage

abi(naa, ref, threshold = 0.9, start_age = 2)

Arguments

naa

numbers-at-age vector

ref

a reference naa vector

threshold

proportion of population to consider "old"

start_age

age at which to start calculating ABI