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Tuesday, March 20, 2007

Net Run Rate Calculation Method for World Cup 2007

India has posted the highest total in the history of the Cricket World Cups and suddenly there is a lot of interest and discussion of the Net Run Rate calculations. Surprisingly, everyone seems to be not very sure about the procedure and after getting a couple of queries regarding the same, I thought it would make sense to do a post on the all important NRR.

Step 1:
Calculating net run rate for a single match. Let me use an actual case to explain - India.

India scored 191 against Bangladesh, batting first. (In such cases the team's full quota of overs will be considered and not the actual number of overs and balls they played.)

Bangladesh scored 192 in 48.3 overs

India's Net Run Rate for that match = (191 ÷ 50) - (192 ÷ 48.5) = ( - 0.14 )

Note ( see red above) : 48.3 overs in mathematical terms becomes 48.5 because 3 balls is actually half an over

Step 2:
Calculating net run rate for the entire Round 1 of the World Cup

= (Average runs scored per over in all the 3 matches by India) - (Average runs scored per over by Bangladesh, Bermuda and Sri Lanka against India)

Note: For teams getting bowled out, the entire quota of overs would be counted

Caution:
Averages of the net run rate of the matches may sometimes give the same answer, but not always.

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Click here for an Explanation of the Twenty20 World Cup 2007 format - Super Eight and all

14 comments:

Homer said...

Thanks Amit. This is most helpful

Vinod said...

Amit, that part of it is straight forward. However, what happens in the case of D/L?

For instance, lets assume rain reduced the game to 45 overs and Bermuda's target was increased to 440 or something. How does net run rate work in that case if Bermuda was still bowled out for 156 in 43 overs?

Amit Bajaj said...

a) Homer - did i tell you that you are a thorough gentleman and it's fans like you who are as important to the game as the players. Thank you.

b) Vinod - I don't think the target is ever revised upwards come what may. In case of d/l, the denominator for the team batting second will change. The numerator continues to be what its actual score will be. So for that match's NRR, its not much of a loss. However, say the match is reduced to 20 overs - in that case the team batting second stands to lose out on the NRR for the first round if this is a relatively high scoring match. In case, it's a relatively low scoring one then the team stands to gain. (because for this team, at the end of the 3 matches approximately 50+50+20 overs will be considered as the denominator and the runs for these 3 matches as the numerator and hence the importance of the 3rd match decreases)

I hope i was clear.

Anonymous said...

Why does the run rate for India currently appear so much lower than Sri Lanka on the official websites? I would expect India to be close enough to Sri Lanka based on the results? SHouldnt India be close to 4.4?

Ravi1010 said...

Thanks Amit. That was pretty useful.Small nuances in calculation..but helps

Amit Bajaj said...

No, that's right - India's current net run rate would be close to 2.5

India's NRR right now
= (191+413)/50 - (192+156)/98.3

Amit Bajaj said...

make that 98.5

Anonymous said...

shouldn't India's NRR be:
(191+413)/100 - (192+156)/98.5

Anonymous said...

good !!

Abhigyan said...

Bajaj, am not sure about the D/L method as u state it..As far as I know, if a team is chasing 220, and there is a shower just after on delivery, and you need to adjust say one over, then the target can actually be 230...Works on such fine margin, but that's the way it is.

Pls do some research and let all know...

Anonymous said...

Can anyone explain why Sri Lanka's NRR is shown as 4.3 at the moment in the super 8 table? They scored 318 in 50 overs, vs Bangladesh's 112. Even if Bangladesh's score is also taken over 50 overs this only gives a NRR of 206/50 = 4.12, and this would decrease if Bangladesh's number of overs was decreased. Help!!

Amit Bajaj said...

In this match, the Duckworth Lewis method was employed to recalculate Bangladesh's target. The new target was 311 in 46 overs. This effectively means that Sri Lanka's score would now be treated as 310 in 46 overs for NRR calculations. So Lanka's NRR = (310-112)/46 = 4.3

Anonymous said...

Ahh it's all clear now! I hadn't realised that Duckworth-Lewis actually changes the "official" score in the first innings. Another subtlety of DL... Many thanks!

bharath said...

what is the current rate of india,sA,AND NZ,