THE
The system is based on the IAAF ranking system, see
the rankings page on www.iaaf.org. The total score has three components:
Performance Score, see below
Placing Score, 1st place 25% of Performance
Score; 2nd 20%; 3rd 16%, etc.
Participation Score, 10 points for completing an
event.
The formulas used to calculate Performance Score are:
Races: Points = d*(a*(b-M)^c)
Field
Events: Points = d*(a*(M-b)^c)
Where M is the actual performance in seconds or
metres, and a, b and c are constants for each event calculated by the IAAF
statisticians, see www.dmultis.org,
"rules of competition". Some
of our JD events are not IAAF events, 80 metre hurdles, 300 metre hurdles, 800
metre race-walk, 1500 metre race-walk and 1500 metre steeple chase. For these events, we've interpolated values
using the events nearest to as our guide.
For JD boys and girls, we use the IAAF women's constants.
Explanation of IAAF constants;
"a"
equalizes the event performances, e.g. high jump (X.xx) has a high number
(916.325) and the 3,000 metres (XXX.xx) a low number (.00683). These constants were set in 1985 with the
then world records scoring 1200 points.
"b"
is the performance so far below standard that it is deemed to score zero
points. For our system we soften
"b" for the groups junior to the 15 year old boys to account for the
age of our younger athletes.
"c"
controls the shape of the curve from the "b" point through the 1200
score.
Constant "d" is set so that Standard
Performance, see below, will score 72 points.
Why 72? So that a perfect performance will score 100:
Performance
at Standard = 72
Participation = 10
Total =100
In most cases Standard Performance is all time #1 on
the JD Top Ten Lists or BC Records for the Juveniles and Juniors. The exceptions are:
Where a more junior record betters that for an older age group, the older performance is applied to the younger group except for the hurdles and weight events that were changed between 1996 and 2000. For these events the opposite applies. As there has been insufficient competition in the race-walks and girls' steeple chase, the Standard Performance for these events is based on relative performances in the 800 and 1500 runs and the boys' steeple chase.