Anon.
Posts:
219
Registered:
12/13/04


Re: Help with probability&stat problem
Posted:
Jun 13, 2007 9:39 AM


Luis A. Afonso wrote: > Added Note > > 1) The discussion was about if C.C. worsen the results comparing with > the raw calculation. IT DID NOT. 2) The two normal approximations > have rather different accuracies (they ARE NOT slightly different > contrarily Bob said).
I'll leave it to others to decide whether 0.9717 and 0.9786 are more than slightly different,
______Relative errors (absolute values): ______ > Not using C.C.___ (282156)/156 = 35.9% _________ using C.C.___ > (144156)/156 = 7.7 % Therefore ______this last one procedure > improves almost FIVE TIMES the result. To use it is an indisputable > MUST. ********************** > But i find this curious: are you really saying that one must use the Normal approximation with a continuity correction, rather than the exact binomial calculation? If so, why? And why can't this be disputed?
Bob
 Bob O'Hara
Dept. of Mathematics and Statistics P.O. Box 68 (Gustaf Hällströmin katu 2b) FIN00014 University of Helsinki Finland
Telephone: +3589191 51479 Mobile: +358 50 599 0540 Fax: +3589191 51400 WWW: http://www.RNI.Helsinki.FI/~boh/ Journal of Negative Results  EEB: http://www.jnreeb.org

