Author: Steve Maughan
Date: 14:13:30 01/29/00
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Christophe, >I'm not sure I understand. But if you don't take draws into account, then your >results are not OK. As I said the binomial distribution does not account for half points. Nevertheless, the program is 100% accurate as long as there is not an odd number of draws. For example suppose A v B resulted in +10 -4 =2 then one would say that the score was A = 11 and b = 5 ie not significantly better at the 95% level. If there are an odd number of draw then you can interpolate. Suppose A v B resulted in 10+ 5- 3= then A has 11.5 and B has 6.5 then once again the score is not signigicant since for when the loser get 6 point the winner must score at least 15 and when the loser score 7 points the winner must score 16; interpolating would suggest that when the loser scores 6.5 the winner must score 15.5 for the result to be significant at 95%. Statistics is not an exact science - in ths case the level of significance required is arbitrary - the whole point of the little program was to show the order of maginitude of the differences required to give a significant result. Regards Steve Maughan
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