Herman's Cricket Ratings
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Cricket backgrounder
Cricket is a bat and ball sport played by two teams of 11 players each. At any point during the game, one team is batting while the other is fielding. The batting team endeavours to score as many runs as possible while the fielding team tries to restrict the runs being scored by the batting team and take ten wickets. When a member of the batting team loses his wicket, he isn't allowed to bat again in the innings. An innings ends when ten wickets have been taken or, in limited overs cricket, when a pre-determined number of overs (usually 50 but 20 is also becoming common) has been bowled. In test matches, each team is allowed two batting innings and usually scores between 200 and 400 runs per innings. In ODI matches, each team is allowed one batting innings restricted to 50 overs and usually scores between 200 and 300 runs per innings. The winner of any particular game is the one who scores the most runs although a test match can be drawn with teams having scored different numbers of runs. (see [ABC of Cricket])
How the test ratings are calculated
Herman starts by creating batting and bowling averages for each team and a global average for all teams. (see [website] explanation)
- Initial batting average = total runs scored divided by total wickets lost
- Initial bowling average = total runs conceded divided by total wickets taken
- Global average = total runs scored by all teams divided by total wickets taken
These strengths are fed back into the original calculations by multiplying the runs scored by a team in a particular game by its opponents 'bowling strength' and the runs conceded by a team by its opponent's 'batting strength'. The modified runs scored and conceded are tallied up again and divided by wicktes lost and taken to create a second iteration of the batting and bowling averages.
This iterative process is repeated until the batting and bowling averages for each team are similar to the previous iteration and these are considered the final batting and bowling averages.
Once the final averages are calculated, a combined rating for each team is created according to the following formula:
Combined rating = (final batting average - final bowling average) * 20
The 20 figure in this occasions represents the number of wickets that need to be taken to win a test match.
How the ODI ratings are calculated
The ODI calculations are similar to those for tests except that wickets are replaced by overs and the figure 20 in the final calculation is replaced by 50 to represent the number of overs in an ODI innings. The same iterative process is used in the middle.
- Initial batting average = total runs scored divided by total overs faced
- Initial bowling average = total runs conceded divided by total overs bowled
- Global average = total runs scored by all teams divided by total overs bowled
- Combined rating = (final batting average - final bowling average) * 50
Notable points
The numbers in Herman's ratings have a 'real' nature in that they can theoretically be used to predict the results of a game. According to the June 2006 rankings, South Africa has a test ranking of +67 while West Indies has a ranking of -158. Herman's ratings predict South Africa should beat West Indies by 225 runs (+67 - -158) in a typical test match.
Herman, himself, is from Belgium, which is not one of the traditional cricket powers. According to his own rankings, Belgium was ranked 73rd out of 91 cricket nations in May 2006. The [Belgian Cricket Federation] website records just 14 clubs in the entire country.
See also
- Cricket Rating Systems
- ICC Test Championship
- ICC ODI Championship
- Amul World Cricket Ratings
- AQB Sports Ratings
- Rediff Cricket Rankings
- XODI Extended ODI Cricket Ratings
External links
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