Calculate QALYs for population

This is a wrapper function for calc_QALY over multiple time horizons (e.g. individuals).

calc_QALY_population(utility, intervals = NA, age = NA,
  start_delay = NA, discount_rate = 0.035, sum_res = TRUE, ...)

Arguments

utility	Vector of utilities for each year in to the future, between 0 and 1
intervals	Time intervals for each utility
age	Vector of ages at start
start_delay	What time delay to origin, to shift discounting
discount_rate	default 3.5%
sum_res	Should the yearly QALYs be summed to a scalar?
...	Additional arguments