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Net Run Rate (NRR) is a statistical method used in analyzing teamwork and/or performance in the sport of cricket. It is the most commonly used method of ranking teams with equal points in limited overs league competitions, analogous to goal difference in association football. The net run rate in a single game is the average runs per over that a team scores, minus the average runs per over that is scored against them. The net run rate in a tournament is the average runs per over that a team scores across the whole tournament, minus the average runs per over that is scored against them across the whole tournament.〔(ICC Playing Handbook 2013/14 Paragraph 21.9.2 )〕〔(Net Run Rate explained ) espncricinfo〕 Note that this is not usually the same as the total or average of the net run rates from the individual matches in the tournament. A positive NRR means a team is scoring faster than its opposition overall, while a negative NRR means a team is scoring slower than the teams it has come up against.〔(Net run rate (NRR) ) about.com〕 It is therefore desirable for the NRR to be as high as possible. ==Step by step explanation== A team's run rate (RR), or runs per over (RPO), is the average number of runs scored per over by the whole team in the whole innings (or the whole innings so far), i.e. . So if a team scores 250 runs off 50 overs then their RR is . Note that as an over is made up of six balls, each ball is 1/6 of an over, despite being normally written in cricket's notation as .1 of an over. So if they got that same score off 47.5 overs, their RR would be . The concept of net run rate involves taking the opponents' final run rate away from the team's run rate, i.e. . Usually, runs and overs are summed together throughout a season to compare teams in a league table. A team's overall NRR for a tournament is not defined as the sum or average of the NRR's from the individual matches, but as: The exceptions to this are: *If a team is bowled out, it is not the overs actually faced which their score is divided by; instead the full quota of overs to which it would have been entitled is used (e.g. 50 overs for an uninterrupted One Day International, and 20 overs for a Twenty20 match).〔 *If a match is abandoned as a No Result, none of the runs scored or overs bowled count towards this calculation.〔 *If a match is interrupted, Duckworth-Lewis revised targets are set, and a result is subsequently achieved, the revised targets and revised overs are used for Team 1's innings (i.e. 1 run less than the final Target Score for Team 2, off the total number of overs allocated to Team 2), and the actual runs scored by Team 2 and overs allocated to Team 2 are used for Team 2's innings. If a match is abandoned, but a result decided by retrospectively applying Duckworth-Lewis, the number of overs assigned to each team for this calculation is the number of overs actually faced by Team 2. Team 1 is credited with Team 2's Par Score (the number of runs they would need to have reached from this number of overs and wickets lost if they were going to match Team 1's score), and the actual runs scored are used by Team 2 for Team 2's innings.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「net run rate」の詳細全文を読む スポンサード リンク
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