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Dr Ian Plummer

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Technical
Notes on Ranking Calculations

Chris Williams adds the following information:

The Class Factor is set as follows:

class factor = 6 for the Opens, Mens, Internationals
class factor = 5 most tournaments
class factor = 4 consolation events

Alpha, used in the smoothing of the grade, is given by:

alpha = ( (Old Grade-1000) / 10000 ) + 0.8

with limits of 0.9 and 0.97 imposed if the above calculation yields larger or smaller numbers. Sample values; 2500: alpha = 0.95, 2000: alpha = 0.9, 1900: alpha = 0.9.

Grade is calculated by:

New Grade = (Old Grade * alpha ) + (New Index * (1 - alpha))

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Updated 28.i.16
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