3 ms·
Ask HN: efficiency, efficacy, effectiveness?!
The more I read about the subject the more confused I become.
I tried to identify the types of those "functions" and work out "definitions". Please correct/expand.
Effectiveness
x -> Bool
Efficacy
x -> (0, 1)
Efficiency
x -> (0, 1)
Effective = 100% efficacious
Efficiency = essential / (essential + non-essential)
- stonemetal 17y agoEfficacy is the noun form of Effective. Efficacy = Effectiveness. Efficiency is the ratio of output to input. Though it seems there is some slight variation in their use in different fields.