Author: Eelco de Groot
Date: 03:14:05 04/21/05
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Hi Odd Gunnar, It is extremely fascinating stuff! Thanks for the graphs. Wonderful! A bit embarrassing I can't yet see from the head where my new routine exactly goes wrong. Didn't yet have time to check myself. Turbo Pascal does not work on this computer. I can try the old 386, but Turbo pascal does not have such great accuracy anyway. First I will try to put it in TI-basic. You were absolutely right about the minus sign. That is equivalent to putting in phi = -(((((c5 * t + c4) * t + c3) * t + c2) * t + c1) * t * sndf)+1 That is how the routine should have been... Since taking -Rtdiff gives the complementary surface under the normal curve that amounts to the same thing! The "groot" curve does follow the normal curve right up to about 0.9, so maybe tolerance factor is to blame. Tol can be a smaller number of course. More likely it simply does not converge at numbers close to one or zero. Eelco
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