Methodology



  • Data


    • T20I scorecards from 2005 to date 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. Peak ratings are identified by checking if the rating before and after the particular match considered is lower.

    • 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.

    • Players lose 1% of their live rating if they miss a team match. This is to ensure injured or dropped players do not stay high in the ratings without playing matches.

  • Ratings


    • Current Top T20I 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 T20I 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). The 95% confidence interval range is shown with a ± after the career rating.

    • Best T20I 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.

    • Location: This is a minor factor that adds a bonus to significant innings completed away from home.

    • Match status: This factor rewards contributions made in significant matches like finals. World cup 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.