Discounted total QALYs up to a defined time horizon.
This is a simpler, alternative function. See S3 Method also available (total_QALYs).
calc_QALY(utility = NA, intervals = NA, age = NA, start_delay = 0, discount_rate = 0.035, utility_method = "add")
| utility | Vector of values between 0 and 1 (1 - utility loss) |
|---|---|
| intervals | Time intervals for each utility, usually whole year i.e. 1. This is useful for fractions of years at the start and end of the period. However, since we may not know this then may not be necessary. |
| age | Year of age |
| start_delay | What time delay to origin, to shift discounting |
| discount_rate | Default: 3.5% per year |
| utility_method | How to combine utilities. Default: |
Uses the following formula, for year i:
$$ \sum interval(i) * utility(i) * QoL(age(i)) * discount(i) $$
for i = 1, ..., time_horizon.
Sassi, Franco, Health Policy and Planning, 5, 402-408, Calculating QALYs, comparing QALY and DALY calculations, volume 21, 2006
calc_QALY(utility = 0.9, age = 13, intervals = 49)#> [[1]] #> [1] 0.8000000 0.7729469 0.7468086 0.7035153 0.6797249 0.6567391 0.6345305 #> [8] 0.6052130 0.5847469 0.5649728 0.5458675 0.5274082 0.5095731 0.4923412 #> [15] 0.4756920 0.4596058 0.4440636 0.4290469 0.4145381 0.4005199 0.3869757 #> [22] 0.3738896 0.3612460 0.3490299 0.3372270 0.3258232 0.3148050 0.2962592 #> [29] 0.2862408 0.2765611 0.2672088 0.2581728 0.2494423 0.2410070 0.2328570 #> [36] 0.2249826 0.2173745 0.1960221 0.1893934 0.1829888 0.1768007 0.1708220 #> [43] 0.1650454 0.1594641 0.1540716 0.1488615 0.1438275 0.1389638 0.1342645 #>