Methodology



  • Data


    • Test scorecards from 1877 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 Test 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 Test Batting Careers:
      This evaluates overall careers by calculating the average performance rating of each batsman, 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 40 matches (increasing penalty for lower matches played). The 95% confidence interval range is shown with a ± after the career rating.

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

    • Best Test Team Batting Peaks:
      This lists the best batting line-ups by aggregate current batting ratings of the players that batted for the team in a match. Only peaks (aggregate rating before and after lower) are shown for clarity.


  • Performance Factors


    • Runs scored: This is the most significant factor. It values runs linearly upto 40, then each additional run becomes less valuable till 200, where the penalty is ever higher. These tiers were decided based on historical analysis of the correlation of runs scored and wins and draws. Scores in excess of 200 are pursued mainly as personal milestones and does not always line up with the team objective.

    • 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. Diminishing returns for scores above 250 to avoid skewing the innings ratings excessively just from runs scored.

    • 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.

    • Point of entry: This factor rewards significant innings made after coming into the crease at difficult situations. This rewards a batsman who makes a significant contribution after coming to the crease at 50/4 over another that makes the same contribution from 100/1.

    • Wickets at crease: This evaluates how a batsman handled the pressure of losing partners on the other end. An opening batsman that makes a significant contribution while carrying his bat through the innings gets the highest value. The credit receieved decreases with batting position of the wickets fallen.

    • Pitch quality: Moderate factor that considers total runs scored by the opposing team to quantify how easy or difficult run scoring is in the match. Adjustments are made for the innings number using historical average scores.

    • Support: Compares the percentage of team runs made with the next highest player. Gives credit for making the team's highest score with little support from others in a completed team innings.

    • Partnership: This factor rewards batsmen for being involved in big partnerships. The highest partnership the player was involved in is compared to the total match runs to evaluate its impact.

    • Strike rate: Minor factor that adds a small bonus based on the strike rate of the innings weighted by the number of runs scored. For innings with no balls faced data, the minutes played percentage or the innings run rate is used to estimate the strike rate.

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

    • Match status: This factor rewards match-winning or match-savings innings made under pressure in the second innings. Significant contributions under pressure in successful fourth innings run chases and third innings come backs get the highest values.

    • Series status: Minor factor that adds a bonus to innings in a series decider and a penalty to innings in dead rubbers.

    • Result: This factor recognizes significant contributions made in wins and draws. 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.

    • Close match: Rewards significant contributions made in close wins in terms of wickets or runs left. Recognizes performances that are remembered for delivering under pressure.

    • Milestone: Minor factor that adds a bonus to innings that reach significant landmarks such as 100, 200 or 300 runs scored.