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 fielding 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 Best/Worst FT20 Fielders:
      This is evaluated using a weighted average of a player's fielding performances. More weight is given to recent performances with past performances diminishing in value with time. Unestablished players that have played less than 10 matches are penalized to avoid cases where a few highly rated matches can catapult a newer player to the top of the pile.

    • Best/Worst FT20 Fielding Careers:
      This evaluates overall careers by calculating the average match fielding rating of each player, with a bonus given to career longevity (where playing the most number of years while missing the least percentage of matches gets the most credit) and a penalty for careers of less than 100 matches (increasing penalty for lower matches played). An additional bonus is added based on the player's drop rate (percentage of catches dropped).

    • Best/Worst FT20 Fielding Performances:
      This is a list of the highest and lowest rated fielding performances.








  • Performance Factors


    • Catches
      Minor factor that credits regulation catches taken with the current rating of the relevant batsmen affecting the value. This is weighted to be 20 times as less important as great catches based on the frequency of regulation catches.

    • Dropped Catches
      Significant negative factor that increases the higher the current rating of the batsman dropped. If the chance was difficult and not expected to be taken, it is not considered a drop - this is assuming that the commentary explicits states that to be the case.

    • Direct Hits
      Major positive factor that credits the fielder with a direct hit to get a batsman run out. The current rating of the batsman involved affects the value.

    • Great Catches
      Major positive factor that credits the fielder with a great catch (if described as such in the commentary). The current rating of the batsman involved affects the value.

    • Runs Saved
      This factor attempts to parse out how many runs a fielder saves through ground fielding. If the commentary does not explicitly state the number of runs saved, an attempt is made to guess it based on the actual runs scored from the fielding event.

    • Missed Stumpings
      Major negative factor that only affects wicket-keepers. The current rating of the batsman is used to evaluate the value.