Author: Maurizio De Leo
Date: 14:34:43 07/31/02
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On July 31, 2002 at 16:34:47, Gian-Carlo Pascutto wrote: >>Actually also #7 Junior is in the "confidence range". > >It isn't. (You can't simply add the error margins) > >sqrt (30^2 + 30^2) = 42 > >Fritz 7 is with >95% confidence better than Junior 7. You are right. With the ipotesis that ssdf ranges are based on a standard normal distribuition Fritz average M1 = 2741 medium square error s1 = 15,306 Junior average M2 = 2689 medium square error s2 = 14,796 so Z = (M1-M2) / sqrt (s1^2 + s2^2) = 52 / 21.29 = 2.44 and being this also a standard normal it leaves indeed way less than 5% probability that Junior has the same strenght of Fritz. Maurizio P.S. Thank you for letting me take off a little rust from my math. P.S.2 So after all the SSDF list isn't so unuseful : it rules out two big pretender (Junior and Hiarcs) for the trone of best computer program.
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