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" percentage and "normal runs" percentage, corresponding to 0–9 wickets fallen. For overs played before an interruption, values are read from the normal runs columns. After an interruption, the "target runs" column is used.
| Overs % | Target run % | Normal runs % for wicket fall | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||
| 20 | 29.8 | 16.9 | 20.6 | 22.6 | 35.0 | 50.0 | 60.0 | 70.0 | 79.0 | 87.0 | 95.0 |
| 40 | 53.5 | 32.4 | 34.5 | 36.5 | 39.7 | 50.0 | 60.0 | 70.0 | 79.0 | 87.0 | 95.0 |
| 50 | 63.4 | 40.4 | 41.7 | 43.0 | 44.3 | 51.9 | 60.0 | 70.0 | 79.0 | 87.0 | 95.0 |
| 60 | 72.3 | 49.2 | 50.1 | 51.1 | 51.4 | 57.9 | 64.6 | 70.0 | 79.0 | 87.0 | 95.0 |
| 80 | 87.6 | 70.7 | 70.8 | 70.9 | 71.0 | 71.2 | 77.1 | 82.4 | 84.3 | 87.0 | 95.0 |
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 for 40 overs out of 50, i.e. 80% of the overs. Using the VJD table, the "target run" % corresponding to 80% overs is 87.6%. So Team 2 must score 246 (280 x 87.6%) runs to win.
Read more about this topic: Jayadevan's System, VJD Method
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