ELO
Rating system
Measure of your ability
relative to the population
1200
1600
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logistic function
WHY ELO
so popular
simplicity and
versatility
not restricted to binary results
multiple-choice questions
partial credit
modeling of answers in the presence of hints
measure of performance
(Time it takes)
Self Correcting
a mechanism for adjusting scores when results are not as expected
Points to Note
- Rating only makes sense inside the system (the populous)
- Rating inflation or rating deflation
- Never significant jumps/drops