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Full details of how
to understand what the ratings mean and how to calculate a rating are
listed below.
Explanation of the table:
A rating for each team is obtained by dividing total points by matches
played, with the answer given to the nearest whole number.
If ratings are equal, the ratings calculation is refined to three
decimal places to determine the higher ranked team.
The matches column for each team includes all ODIs played since August
2003 but earlier matches have a lower 'weighting' so that the rankings
more fully reflect recent form.
The number of points earned by a team for any ODI match depends on two
factors: the result (won, tied or lost) and the rating of the opponent
against whom the result was achieved. The higher an opponent's rating,
the more points are earned for beating them. Points are ‘weighted’ in
the same way as matches.
A team that over the period being rated wins as often as it loses
while playing an average mix of strong and weak opponents will have a
rating of close to 100.
Matches abandoned with no result are always ignored.
Only matches between full members are rated, so matches involving the
USA at the ICC Champions Trophy 2004 are excluded.
Kenya, which was previously ranked in the official table, has not
played sufficient matches to record a rating during the current
period. If it does so it will re-join the other 10 sides in the
official standings.
Period covered:
The ratings are based on up to three years of results.
The table currently reflects all ODIs played since August 1, 2003.
All ODIs played until the start of August 2006 will be added on to
this table.
Every August, the first year of results will be dropped from the
table, so it will then cover the most recent two years of results.
Thus once a year, the rankings will change overnight without any new
ODIs being played.
Weighting of results:
All matches included within the rankings will always fall into one of
three time periods. Weightings are applied to these three groups of
matches so that the rankings more fully reflect recent form. These
weightings are:
Period One covers the first year of matches (weighting: one-third)
Period Two covers the second year of matches (weighting: two-thirds)
Period Three covers the remaining more recent matches (weighting: one)
The number of matches played and the number of points earned in each
period is multiplied by the weighting factor. For example, when the
table was first launched, Sri Lanka had played 33 ODIs in Period One,
with a weighting of one third, this counted as 11 matches towards its
rating. Similarly, 21 ODIs played in Period Two counted as 14. so the
number of matches shown for Sri Lanka in the table was 11 plus 14 plus
the 10 they had played at that time in Period Three - a total of 35. A
small technical adjustment ensures that, for all teams, the total
number of matches and rating points is always a whole number.
Applying the ratings formula:
After each match, the two teams each score a certain number of points.
These points are then added to their existing total and used to
generate their updated ratings. The number of points a team scores is
based on two factors:
the result of the match and
the gap between the ratings of the two teams going into the match.
There are two different formulas. One applies if the gap between the
two teams' ratings is less than 40 points, the other if the gap is 40
points or more. The points you score from a particular ODI are as
follows:
Case 1 - gap between the two teams' ratings is less than 40 points:
if you win, you score 50 points more than your opponent's rating
if you lose, you score 50 points less than your opponent's rating
if you tie, you score your opponent's rating
Case 2 - gap between the two teams' ratings is 40 points or more:
if the stronger team wins, it scores 10 points more than its own
rating while the weaker team scores 10 points less than its own rating
if the weaker team wins, it scores 90 points more than its own rating
while the stronger team scores 90 points less than its own rating
if the match is tied, the stronger team scores 40 points less than its
own rating and the weaker team scores 40 points more than its own
rating
MORE DETAILS
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