Wikipedia - User contributions [en]

Net run rate

2011-03-02T18:51:09Z

Sportsenthu: /* Scenarios */

{{Dablink|NRR redirects here. NRR also refers to [[Earplug#Noise_reduction_ratings|Noise Reduction Rating]].}}
{{see also|Net Reproduction Rate}}

{{Unreferenced|date=December 2009}}

'''Net Run Rate (NRR)''' is a statistic used in the sport of [[cricket]]. It is the most commonly used method of separating teams in [[One day cricket|one-day]] league competitions, effectively acting as the Cricket equivalent of "[[goal difference]]" in [[Football (soccer)|football]].

The net run rate in a single game is the run rate per over that a team scores, minus the run rate per over that is scored against them.

==Step by step explanation==
A team's run rate (RR) is their total number of runs divided by overs faced. As an [[Over (cricket)|over]] is made up of six balls, each ball counts for 1/6 of an over for the purposes of calculating the net run rate, despite being normally written in cricket's notation as .1 of an over.

So if a team scores 250 runs off 50 overs then their runrate is <math>\frac{250}{50} = 5</math>. If they got that same score off 47.5 overs, their RR would be <math>\frac{250}{47\frac{5}{6}} \approx 5.226</math>

The concept of net run rate involves taking the opponents' final run rate away from the team's run rate. The only complication is that if a team is bowled out, it is not the balls faced which their score is divided by; instead the full quota of overs is used (e.g. 50 overs for a One Day International and 20 overs for a Twenty20 match).

Usually, runs and overs bowled are summed together throughout a season to compare teams in a league table, as the following formula shows-

<math>\mbox{net run rate }=\frac{\mbox{total runs scored}}{\mbox{total overs faced}}-\frac{\mbox{total runs conceded }}{\mbox{total overs bowled}} </math>

==Scenarios==
All scenarios assume [[One Day International]] rules with 50 overs per side.

'''1. Side that bats first wins'''
* Team A bat first and set a target of 287-6 off their full quota of fifty overs. Team B fail in their run chase, early losses causing them to struggle to 243-8 in their 50 overs.
* Team A's runrate is <math>\frac{287}{50} = 5.74</math>
* Team B's runrate is <math>\frac{243}{50} = 4.86</math>
* Team A's NRR for this game is 5.74 − 4.86 = 0.88 Assuming this was the first game of the season, their NRR for the league table would be +0.88.
* Team B's NRR for this game is 4.86 − 5.74 = −0.88. If this was the first game of the season, their NRR for the league table would be −0.88.

'''2. Side that bats second wins'''
* Team A bat first and set a target of 265-8 off their full quota of fifty overs. Team B successfully chase, getting their winning runs with a four with sixteen balls (2.4 of the 50 overs) remaining, leaving them on 267-5.
* Team A's runrate is <math>\frac{265}{50} = 5.30</math>
* Team B faced 47.2 overs, so their runrate is <math>\frac{267}{47.33} \approx 5.64</math>
* Assuming that Team A and Team B had previously played as in the game in scenario one, the new net run rate for team A would be <math>\frac{287+265}{50+ 50}-\frac{243+267}{50+47.33} = \frac{552}{100}-\frac{510}{97.33} \approx 0.28</math>

'''3. Side that bats first is bowled out. Side batting second wins.'''
* Team A bat first and are skittled out for 127 off 25.4 overs. Team B reach the target for the loss of four wickets off 25.5 overs, scoring a single to win the game and end with 128 runs.
* Despite Team A's runrate for the balls they faced being 127 / 25.667 = 4.95 (2dp) because they were bowled out the entire 50 overs are added to their total overs faced tally for the tournament, and Team B are credited with having bowled 50 overs.
* Team B actually scored at a slower pace, however they managed to protect their wickets. Thus, only the 25 .(5/6) overs are added to the seasonal tally.

'''4. Side that bats second is bowled out. Side batting first wins.'''
* Team A bat first and set a formidable 295-7 off their complement of 50 overs. Team B never get close, being bowled out for 184 off 35.4 overs.
* As in scenario 2, 295 runs and 50 overs are added to Team A's tally.
* However, Team B, despite facing only 35.4 overs, have faced 50 overs according to the NRR calculations, and Team A have bowled 50 overs.

'''5. Both sides are bowled out, the team batting first therefore taking the points.'''
* Team A bat first, and manage 117 off 24 overs on a difficult playing surface. Team B fall agonizingly short, reaching 112 off 23.3 overs.
* In this case, both teams get 50 overs both faced and bowled in the overs column for the season, just as in example 1.

'''6. The game ends in a tie '''
* Runs and overs are added as in the examples above, with teams bowled out being credited with their full quota of overs. Thus, the net run rate will always be zero for both teams.

'''7. Interrupted games with revised targets.'''
* In matches ware set due to interruptions which reduce the number of overs bowled, those revised targets are used to calculate the net run rate.
* For example, in a 50-over World Cup first-round group match, Team A are dismissed for 165 in 33.5 overs.
* Team B progresses to 120-0, but play is halted after 18 overs due to rain.
* Six overs are lost, and the target is reset to 150, which Team B reach comfortably after 26.2 overs with only 2 wickets lost.
* Because the target was revised, 6 overs were lost and Team A were bowled out, Team A's total is reset to 149 after 44 overs, thus their RR <math>=
\frac{149}{44} \approx 3.39</math>. Team B's RR, however, is computed as normal: <math>\frac{150}{26.33} \approx 5.70</math>.
* Computing the match NRR for Team A gives us 3.39 - 5.70 = -2.31. Team B's NRR is: 5.70 - 3.39 = 2.31.

'''8. Abandoned games recorded as No-Result.'''
* Abandoned games are not considered, whatever the stage of the game at stoppage may be, and the scores in such games are immaterial to NRR calculations.

'''How is the NRR calculated when there is more than one match in a tournament?'''
Most of the time, in limited over cricket, there may be round-robin match among several teams. In that case the NRR is the average of the NRRs of all the matches played.

For example, let us a consider a team that played 3 matches and acquired NRR of 1.31, -2.31 and 1.85, respectively. At the end of the third match the overall NRR of the team is <math>=\frac{(1.31+(-2.31)+1.85)}{3} \approx 0.28 </math>

In some tournament(IPL) the NRR in round robin matches are caculated slightly different. The RR of a team (say, Team-A) is calculated by dividing the total number of runs scored by Team-A in all the matches by the total number of overs. The opposition RR is similarily calculated by considering the total number of runs scored and number of overs played by the opposing teams of Team-A against Team-A. The NRR of Team-A is the difference of these RRs.

==References==
{{reflist}}
* http://www.espncricinfo.com/ci/content/page/429305.html
* http://cricket.butjazz.com/net-run-rate-calculation-how-to-calculate-nrr/
[[Category:Cricket terminology]]

[[de:Net Run Rate]]
[[hi:नेट रन रेट]]

Net run rate

2011-03-02T18:35:48Z

Sportsenthu: /* Scenarios */

{{Dablink|NRR redirects here. NRR also refers to [[Earplug#Noise_reduction_ratings|Noise Reduction Rating]].}}
{{see also|Net Reproduction Rate}}

{{Unreferenced|date=December 2009}}

'''Net Run Rate (NRR)''' is a statistic used in the sport of [[cricket]]. It is the most commonly used method of separating teams in [[One day cricket|one-day]] league competitions, effectively acting as the Cricket equivalent of "[[goal difference]]" in [[Football (soccer)|football]].

The net run rate in a single game is the run rate per over that a team scores, minus the run rate per over that is scored against them.

==Step by step explanation==
A team's run rate (RR) is their total number of runs divided by overs faced. As an [[Over (cricket)|over]] is made up of six balls, each ball counts for 1/6 of an over for the purposes of calculating the net run rate, despite being normally written in cricket's notation as .1 of an over.

So if a team scores 250 runs off 50 overs then their runrate is <math>\frac{250}{50} = 5</math>. If they got that same score off 47.5 overs, their RR would be <math>\frac{250}{47\frac{5}{6}} \approx 5.226</math>

The concept of net run rate involves taking the opponents' final run rate away from the team's run rate. The only complication is that if a team is bowled out, it is not the balls faced which their score is divided by; instead the full quota of overs is used (e.g. 50 overs for a One Day International and 20 overs for a Twenty20 match).

Usually, runs and overs bowled are summed together throughout a season to compare teams in a league table, as the following formula shows-

<math>\mbox{net run rate }=\frac{\mbox{total runs scored}}{\mbox{total overs faced}}-\frac{\mbox{total runs conceded }}{\mbox{total overs bowled}} </math>

==Scenarios==
All scenarios assume [[One Day International]] rules with 50 overs per side.

'''1. Side that bats first wins'''
* Team A bat first and set a target of 287-6 off their full quota of fifty overs. Team B fail in their run chase, early losses causing them to struggle to 243-8 in their 50 overs.
* Team A's runrate is <math>\frac{287}{50} = 5.74</math>
* Team B's runrate is <math>\frac{243}{50} = 4.86</math>
* Team A's NRR for this game is 5.74 − 4.86 = 0.88 Assuming this was the first game of the season, their NRR for the league table would be +0.88.
* Team B's NRR for this game is 4.86 − 5.74 = −0.88. If this was the first game of the season, their NRR for the league table would be −0.88.

'''2. Side that bats second wins'''
* Team A bat first and set a target of 265-8 off their full quota of fifty overs. Team B successfully chase, getting their winning runs with a four with sixteen balls (2.4 of the 50 overs) remaining, leaving them on 267-5.
* Team A's runrate is <math>\frac{265}{50} = 5.30</math>
* Team B faced 47.2 overs, so their runrate is <math>\frac{267}{47.33} \approx 5.64</math>
* Assuming that Team A and Team B had previously played as in the game in scenario one, the new net run rate for team A would be <math>\frac{287+265}{50+ 50}-\frac{243+267}{50+47.33} = \frac{552}{100}-\frac{510}{97.33} \approx 0.28</math>

'''3. Side that bats first is bowled out. Side batting second wins.'''
* Team A bat first and are skittled out for 127 off 25.4 overs. Team B reach the target for the loss of four wickets off 25.5 overs, scoring a single to win the game and end with 128 runs.
* Despite Team A's runrate for the balls they faced being 127 / 25.667 = 4.95 (2dp) because they were bowled out the entire 50 overs are added to their total overs faced tally for the tournament, and Team B are credited with having bowled 50 overs.
* Team B actually scored at a slower pace, however they managed to protect their wickets. Thus, only the 25 .(5/6) overs are added to the seasonal tally.

'''4. Side that bats second is bowled out. Side batting first wins.'''
* Team A bat first and set a formidable 295-7 off their complement of 50 overs. Team B never get close, being bowled out for 184 off 35.4 overs.
* As in scenario 2, 295 runs and 50 overs are added to Team A's tally.
* However, Team B, despite facing only 35.4 overs, have faced 50 overs according to the NRR calculations, and Team A have bowled 50 overs.

'''5. Both sides are bowled out, the team batting first therefore taking the points.'''
* Team A bat first, and manage 117 off 24 overs on a difficult playing surface. Team B fall agonizingly short, reaching 112 off 23.3 overs.
* In this case, both teams get 50 overs both faced and bowled in the overs column for the season, just as in example 1.

'''6. The game ends in a tie '''
* Runs and overs are added as in the examples above, with teams bowled out being credited with their full quota of overs. Thus, the net run rate will always be zero for both teams.

'''7. Interrupted games with revised targets.'''
* In matches ware set due to interruptions which reduce the number of overs bowled, those revised targets are used to calculate the net run rate.
* For example, in a 50-over World Cup first-round group match, Team A are dismissed for 165 in 33.5 overs.
* Team B progresses to 120-0, but play is halted after 18 overs due to rain.
* Six overs are lost, and the target is reset to 150, which Team B reach comfortably after 26.2 overs with only 2 wickets lost.
* Because the target was revised, 6 overs were lost and Team A were bowled out, Team A's total is reset to 149 after 44 overs, thus their RR <math>=
\frac{149}{44} \approx 3.39</math>. Team B's RR, however, is computed as normal: <math>\frac{150}{26.33} \approx 5.70</math>.
* Computing the match NRR for Team A gives us 3.39 - 5.70 = -2.31. Team B's NRR is: 5.70 - 3.39 = 2.31.

'''8. Abandoned games recorded as No-Result.'''
* Abandoned games are not considered, whatever the stage of the game at stoppage may be, and the scores in such games are immaterial to NRR calculations.

'''How is the NRR calculated when there is more than one match in a tournament?'''
Most of the time, in limited over cricket, there may be round-robin match among several teams. In that case the NRR is the average of the NRRs of all the matches played.

For example, let us a consider a team that played 3 matches and acquired NRR of 1.31, -2.31 and 1.85, respectively. At the end of the third match the overall NRR of the team is <math>=\frac{(1.31+(-2.31)+1.85)}{3} \approx 0.28 </math>

==References==
{{reflist}}
* http://www.espncricinfo.com/ci/content/page/429305.html
* http://cricket.butjazz.com/net-run-rate-calculation-how-to-calculate-nrr/
[[Category:Cricket terminology]]

[[de:Net Run Rate]]
[[hi:नेट रन रेट]]

User talk:Sportsenthu

2008-11-26T15:59:18Z

Sportsenthu: /* AfD nomination of Rules for the game of Throw Ball */

{{welcome}}
==Proposed deletion of Rules for the game of Throw Ball==
[[Image:Ambox warning yellow.svg|left|48px|]]
A [[Wikipedia:Proposed deletion|proposed deletion]] template has been added to the article [[Rules for the game of Throw Ball]], suggesting that it be deleted according to the proposed deletion process{{#if: Not notable, not encyclopedic, and has no references. [[WP:NOTWEBHOST]].|  because of the following concern:|.}}
:<b>Not notable, not encyclopedic, and has no references. [[WP:NOTWEBHOST]].</b>

All contributions are appreciated, but this article may not satisfy Wikipedia's [[Wikipedia:Criteria for inclusion|criteria for inclusion]], and the deletion notice should explain why (see also "[[Wikipedia:What Wikipedia is not|What Wikipedia is not]]" and [[Wikipedia:Deletion policy|Wikipedia's deletion policy]]). You may prevent the proposed deletion by removing the <code>{{tl|dated prod}}</code> notice, but please explain why you disagree with the proposed deletion in your edit summary or on [[Talk:Rules for the game of Throw Ball|its talk page]].

Please consider improving the article to address the issues raised because, even though removing the deletion notice will prevent deletion through the [[WP:PROD|proposed deletion process]], the article may still be deleted if it matches any of the [[Wikipedia:Criteria for speedy deletion|speedy deletion criteria]] or it can be sent to [[Wikipedia:Articles for deletion|Articles for Deletion]], where it may be deleted if [[Wikipedia:Consensus|consensus]] to delete is reached. [[User:KurtRaschke|KurtRaschke]] ([[User talk:KurtRaschke|talk]]) 18:37, 25 November 2008 (UTC)

==AfD nomination of Rules for the game of Throw Ball==
[[Image:Ambox warning pn.svg|48px|left]]I have nominated [[Rules for the game of Throw Ball]], an article that you created, for [[Wikipedia:Deletion policy|deletion]]. I do not think that this article satisfies Wikipedia's criteria for inclusion, and have explained why at [[Wikipedia:Articles for deletion/Rules for the game of Throw Ball]]. Your opinions on the matter are welcome at that same discussion page; also, you are welcome to edit the article to address these concerns. Thank you for your time.  [[User:KurtRaschke|KurtRaschke]] ([[User talk:KurtRaschke|talk]]) 18:58, 25 November 2008 (UTC)
Have contributed this article after consolidating the different ways this game is being played. The article does not have any reference as there is no concrete law laid out. We have tried to create the laws so that it can be followed by everyone and all can have fun in playing this game. Thanks --[[User:Sportsenthu|sportsenthu]] ([[User talk:Sportsenthu#top|talk]]) 19:25, 25 November 2008 (UTC)
*[[Wikipedia:No original research|Wikipedia is not the place for constructing novel sets of rules]], [[Wikipedia:Verifiability|nor is it the place for things that have not been documented elsewhere]]. Please read our official policies and learn what the intent of this project is. [[User:Uncle G|Uncle G]] ([[User talk:Uncle G|talk]]) 13:48, 26 November 2008 (UTC)
Thanks Uncle G for reminding me on the official policies.I fully understand that Wikipedia is not a place to publish primary research, orginal inventions, personal essays, discussion forums or Jounalism. I'm sure you would have come across articles in Wikipedia that has deviated from this norm.My article is not a construction of novel set of rules.It is a consolidation of rules as played in the game.I don't claim orginality of those rules.They have been in vogue for a long time and I just happen to make it available in one place.
Thanks for your time

User talk:Sportsenthu

2008-11-25T19:25:40Z

Sportsenthu: /* AfD nomination of Rules for the game of Throw Ball */

==Proposed deletion of Rules for the game of Throw Ball==
[[Image:Ambox warning yellow.svg|left|48px|]]
A [[Wikipedia:Proposed deletion|proposed deletion]] template has been added to the article [[Rules for the game of Throw Ball]], suggesting that it be deleted according to the proposed deletion process{{#if: Not notable, not encyclopedic, and has no references. [[WP:NOTWEBHOST]].|  because of the following concern:|.}}
:<b>Not notable, not encyclopedic, and has no references. [[WP:NOTWEBHOST]].</b>

All contributions are appreciated, but this article may not satisfy Wikipedia's [[Wikipedia:Criteria for inclusion|criteria for inclusion]], and the deletion notice should explain why (see also "[[Wikipedia:What Wikipedia is not|What Wikipedia is not]]" and [[Wikipedia:Deletion policy|Wikipedia's deletion policy]]). You may prevent the proposed deletion by removing the <code>{{tl|dated prod}}</code> notice, but please explain why you disagree with the proposed deletion in your edit summary or on [[Talk:Rules for the game of Throw Ball|its talk page]].

Please consider improving the article to address the issues raised because, even though removing the deletion notice will prevent deletion through the [[WP:PROD|proposed deletion process]], the article may still be deleted if it matches any of the [[Wikipedia:Criteria for speedy deletion|speedy deletion criteria]] or it can be sent to [[Wikipedia:Articles for deletion|Articles for Deletion]], where it may be deleted if [[Wikipedia:Consensus|consensus]] to delete is reached. [[User:KurtRaschke|KurtRaschke]] ([[User talk:KurtRaschke|talk]]) 18:37, 25 November 2008 (UTC)

==AfD nomination of Rules for the game of Throw Ball==
[[Image:Ambox warning pn.svg|48px|left]]I have nominated [[Rules for the game of Throw Ball]], an article that you created, for [[Wikipedia:Deletion policy|deletion]]. I do not think that this article satisfies Wikipedia's criteria for inclusion, and have explained why at [[Wikipedia:Articles for deletion/Rules for the game of Throw Ball]]. Your opinions on the matter are welcome at that same discussion page; also, you are welcome to edit the article to address these concerns. Thank you for your time.  [[User:KurtRaschke|KurtRaschke]] ([[User talk:KurtRaschke|talk]]) 18:58, 25 November 2008 (UTC)
Have contributed this article after consolidating the different ways this game is being played. The article does not have any reference as there is no concrete law laid out. We have tried to create the laws so that it can be followed by everyone and all can have fun in playing this game.
Thanks
--[[User:Sportsenthu|sportsenthu]] ([[User talk:Sportsenthu#top|talk]]) 19:25, 25 November 2008 (UTC)