implement Spectrum ART allocation #43
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There has been a longstanding discrepancy betweeen EPP-ASM and Spectrum in ART allocation.
For ART allocation by 'expected mortality', EPP-ASM allocated according to mortality by CD4
and age.
Spectrum allocates ART in a two step process: first, ART is allocated by CD4 category based
on the 'expected mortality' and 'proportional to eligibility' weight. Second, within
CD4 categories, ART is allocated by age solely proportional to number in each age
group (propotional to eligibility).
This has modest overall difference, but was a source of numerical differences between
Spectrum and EPP-ASM.
See mrc-ide/leapfrog#53
Update 21 Oct 2024: add commit to implement Spectrum Adult ART scalar adjustment. This is a user input that allows the input number on ART to be adjusted by a scalar to account for over/under-reporting of treatment numbers.