The V Jayadevan system, also known as the VJD method, is a proposed method for calculating target scores in interrupted one-day and

Twenty20 Twenty20 (T20) is a shortened game format of cricket. At the professional level, it was introduced by the England and Wales Cricket Board (ECB) in 2003 for the inter-county competition. In a Twenty20 game, the two teams have a single innin ...

cricket Cricket is a bat-and-ball game played between two teams of eleven players on a field at the centre of which is a pitch with a wicket at each end, each comprising two bails balanced on three stumps. The batting side scores runs by striki ...

matches. The method was devised by V. Jayadevan, an

Indian Indian or Indians may refer to: Peoples South Asia * Indian people, people of Indian nationality, or people who have an Indian ancestor ** Non-resident Indian, a citizen of India who has temporarily emigrated to another country * South Asia ...

engineer Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the l ...

. It can be used instead of

DLS method DLS or D.L.S. may refer to: Education * Doctor of Liberal Studies, an academic degree Organizations * Democratic Left Scotland * ''Danmarks Liberale Studerende'' or Liberal Students of Denmark * Directorate Legal Services, or RAF Legal Branch * ...

VJD Method

VJD method is essentially built around two

curve In mathematics, a curve (also called a curved line in older texts) is an object similar to a line (geometry), line, but that does not have to be Linearity, straight. Intuitively, a curve may be thought of as the trace left by a moving point (ge ...

s. The first curve depicts the "normal" run getting pattern; i.e., when there is no interruption and the side is expecting to bat its full quota of overs. The second curve ("target curve") indicates how the batting side should "speed up" after an interruption. The "normal" curve takes into account both the percentage of overs played and the percentage of

wickets In cricket, the term wicket has several meanings: * It is one of the two sets of three stumps and two bails at either end of the pitch. The fielding team's players can hit the wicket with the ball in a number of ways to get a batsman out. ...

lost. The "target" curve, which is used to set revised targets, only considers the percentage of overs played.

Obtaining the curves

To obtain the normal score curve VJD System considers the percentage of runs scored in seven phases: settling down (first 10% of the overs, i.e. the five overs), exploiting field restrictions (next 20% of the overs, i.e. overs 6–15), stabilising the innings-I (next 20%; overs 16–25), stabilising the innings-II (next 10%; overs 26–30), beginning the acceleration (next 20%; overs 31–40), secondary stage of acceleration (next 10%; overs 41–45) and final slog (last 10%; overs 46–50). The normal score curve is then obtained by fitting a suitable regression equation for the cumulative overs % and the corresponding cumulative runs scored %. VJD System obtains the target score by looking at the percentage of runs scored in each of the seven scoring phases, arranges them in descending order of run productivity, and again obtains a regression fit for cumulative overs % versus the juxtaposed cumulative runs scored %. The table has twelve columns: overs percentage, "target runs" Gokul percentage and "normal runs" percentage, corresponding to 0–9

fallen. For overs played before an interruption, values are read from the normal runs columns. After an interruption, the "target runs" column is used. For example. If Team 1 score 280 runs in 50 overs. During the break, there is a shower and Team 2 can only bat for 40 overs. Following the interruption, Team 2 must

bat Bats are mammals of the order Chiroptera.''cheir'', "hand" and πτερόν''pteron'', "wing". With their forelimbs adapted as wings, they are the only mammals capable of true and sustained flight. Bats are more agile in flight than most bi ...

for 40 overs out of 50, i.e. 80% of the overs. Using the VJD table, the "target

run Run(s) or RUN may refer to: Places * Run (island), one of the Banda Islands in Indonesia * Run (stream), a stream in the Dutch province of North Brabant People * Run (rapper), Joseph Simmons, now known as "Reverend Run", from the hip-hop group ...

" % corresponding to 80% overs is 87.6%. So Team 2 must score 246 (280 x 87.6%) runs to win.

Use in national and international cricket

On 13 December 2010, it was reported that the BCCI had decided that Jayadevan's system will be formally used in the fourth edition of

Indian Premier League The Indian Premier League (IPL), also known as TATA IPL for sponsorship reasons, is a men's T20 franchise cricket league of India. It is annually contested by ten teams based out of seven Indian cities and three Indian states. The leagu ...

but it was not. The Duckworth-Lewis system was used in the third season and the fourth season of the league. The ICC still uses the Duckworth Lewis method in all international matches. The Jayadevan system has been put before the ICC in the past, but the decision was made to retain the Duckworth-Lewis method. Generally speaking, nobody has been able to successfully argue that either the Duckworth-Lewis Method or the Jayadevan System is significantly superior to the other, with most assessments concluding that their performance is reasonably similar.

Comparison with the Duckworth-Lewis method

Both the Duckworth-Lewis method and the Jayadevan System use a statistical method to determine what proportion of a team's runs it is expected to have scored, based upon the number of overs faced and the number of wickets lost (traditionally referred to as the ''resources'' available to a team). However, there are two primary differences between the two methods: *The mathematical relationship used in the Duckworth Lewis system assumes that a team's scoring rate accelerates throughout the team's innings – slowly at first, but more rapidly during the final ten to fifteen overs (the "slog overs"). Jayadevan's relationship is more empirical than Duckworth-Lewis', and assumes that the scoring rate is faster during the first fifteen to twenty overs during fielding restrictions, decelerates during the middle overs when most teams try to consolidate their innings, and then accelerates again for the slog overs. In this way, Jayadevan tries to improve upon Duckworth-Lewis' notion of the "typical innings". *Secondly, Duckworth-Lewis is based upon a single set of curves which is used to make all adjustments to the scores. The Jayadevan method has two different curves: the "normal curves", which are used to adjust runs already scored by the batting team; and the "target curve", which is used to adjust the runs that the batting team is yet to score. Jayadevan's justification for this is that prior to a rain interruption, a team will base its batting tactics on the assumption that it has its full quota of overs available; but, following an interruption, a team can change its batting tactics to suit the new number of overs – so, if the tactics are inherently different, the curves used to calculate the run targets should also be different. Under Jayadevan's method, the "normal" curve takes into account both the percentage of overs played and the percentage of wickets lost. The "target" curve considers only the percentage of overs played; ''i.e.'' no adjustment is made according to the number of wickets lost.

References

{{Reflist

External links

Comparison with D/L method

* Jayadevan, V. "An improved system for the computation of target scores in interrupted limited over cricket matches adding variations in scoring range as another parameter." ''Current Science'' 86, no. 4 (2004): 515–517
PDF
* Jayadevan, V. "A new method for the computation of target scores in interrupted, limited over cricket matches " ''Current Science'' 83, no. 5 (2002): 577–586
PDF

Limited overs cricket Scoring (cricket)