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Net Run Rate explained
Net Run Rate (NRR) has become the preferred method of breaking ties
in multi-team one-day international tournaments. It is often
misunderstood, but really quite simple to understand. The example and
exlanation below is excerpted from CricInfo365's World Cup 1999 edition.
As explained in clause 11.6 of the 1999 World Cup playing conditions,
"A team's net run rate is calculated by deducting from the average runs
per over scored by that team, the average runs per over scored against
that team".
Clause 11.6 goes on to say that "In the event of a team being all out
in less than its full quota of overs, the calculation of its net run
rate shall be based on the full quota of overs to which it would have
been entitled and ot on the number of overs in which the team was
dismissed."
Let's take as an example South Africa's net run-rate in the 1999
World Cup. South Africa's listing in the Group A points table published
in the group stages was as follows:
P W L NR T Pts Net-RR For Aga
South Africa 3 3 - - - 6 +1.495 678/147.2 466/150
The columns we are looking at here are the last three: "Net-RR", "For"
and "Aga". The figure in the "Net-RR" column is achieved by subtracting
the answer of the division in the "Aga" column from the answer to the
division in the "For" column.
To use this example:
FOR
South Africa had scored, so far in the tournament:
- Against India, 254 runs (for 6 wkts) from 47.2 overs
- Against Sri Lanka, 199 runs (for 9 wkts) from 50 overs
- Against England, 225 runs (for 7 wkts) from 50 overs
Across the three games, South Africa scored 678 runs in a total of 147
overs and 2 balls (actually 147.333 overs), a rate of 678/147.333 or
4.602 rpo.
AGAINST
Teams opposing South Africa scored:
- India, 253 (for 5 wkts) from 50 overs.
- Sri Lanka, 110 all out from 35.2 overs.
- England, 103 all out from 41 overs.
In the case of Sri Lanka and England, because they were all out before
their allotted 50 overs expired, the run rate is calculated as if they
had scored their runs over the full 50 overs.
Therefore, the run-rate scored against South Africa across the first
three games is calculated on the basis of 466 runs in a total of 50 + 50
+ 50 = 150 overs, a rate of 466/150 or 3.107 rpo.
NET-RR
The net run-rate is, therefore,
4.602 Run-rate for
3.107 Run-rate against
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+ 1.495 ANSWER
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