Methodology



  • Data

    • The following franchises are considered:
      • IPL (Indian Premier League, from 2008)
      • BBL (Big Bash League, from 2011)
      • CPL (Caribbean Premier League, from 2013)

    • The IPL is taken as the standard of quality franchise T20 cricket, so only leagues that relatively match its quality with siginificant international player presence are considered.

    • FT20 scorecards are parsed to rate every batting performance. Scorecard information is sourced to generate an accurate assessment of each player's performance.

    • Match results are used to generate team ratings. Fielding performances are evaluated by parsing detailed text commentary (More detail here). Win shares are calculated by attributing over-by-over team match odds changes to the appropriate player.

  • Ratings


    • Current Top FT20 Batsmen:
      This is evaluated using a weighted average of a batsman's performances. More weight is given to recent performances with past performances diminishing in value with time. Unestablished batsmen that have played less than 20 innings are penalized to avoid cases where a few highly rated innings can catapult a newer batsman to the top of the pile.

    • Best FT20 Batting Careers:
      This evaluates overall careers by calculating the average performance rating of each batsman, with a bonus given to career longevity and a penalty for careers of less than 20 matches (increasing penalty for lower matches played).

    • Best FT20 Batting Performances:
      This is a list of the highest rated batting performances calculated using the factors detailed here.








  • Performance Factors


    • Runs + Strike rate: This is the most significant factor - it multiplies the runs scored with the strike rate relative to the team's strike rate.

    • Not out: This factor comes into play significantly when a batsman completes an innings below his expected innings rating without being dismissed. The overall rating is adjusted to assume an average innings rating (using his current batting rating) if lower than average and adds a diminishing bonus if the rating is already above average.

    • Percentage of total: Moderate factor that considers the percentage of team runs scored by the batsman.

    • Bowling quality: Major factor that considers the current rating of the bowling attack (adjusted by the percentage of overs bowled by each bowler). Adds increased value to more significant innings to avoid rewarding low scores against good attacks.

    • Match status: This factor rewards contributions made in significant matches like finals. League knock-out matches are the most highly rewarded.

    • Result: This factor recognizes significant contributions made in wins and ties. Positive results against higher rated teams are rewarded more than against lower rated teams, using the current rating at the time of the match of the opposition team.

    • Milestone: Minor factor that adds a bonus to innings that reach the fifty landmark.