Calculate elo scores for rating quality of team/players in zero-sum head-to-head match ups.
Contains:
independent module of elo-calculating functions (elo.py)
module for reading spreadsheets of results and calculating current elo scores for a collection of competitors (summarizeleague.py)
(can handle either relative scores or win-loss-draw format)
sample spreadsheets (ipl2017.csv, nwsl2017.csv)