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Quote:

Originally Posted by jfc

http://www.flatstats.co.uk/articles/impact_values.html

This free article defines and describes Impact Values, as well as providing a history of that methodology which preceded the computer commodity age.

Note that there is no mention of field size in that article.

Mr jfc,
hello. yes it is good article. have you actually read it?
i quote now from the article

Quote:

Examining 69234 runners in 6678 races on the all weather we find that 5548 were last time out winners. Of those last time winners 1107 went on to win this race.

if the 69234 runners mentioned were not the sum of the field sizes of the 6678 races then can you please tell me what they are? random number perhaps? i quote more.
IV=% of winners / % of runners
surely "% of runners" mean you must have field sizes for all races you consider?
is that enough proof for you?
Thank you. Winston.