[WP34S] ChiSquare Distribution

01122014, 02:37 PM
Post: #5




RE: [WP34S] ChiSquare Distribution
(01112014 11:11 PM)Paul Dale Wrote: The distribution code hasn't changed since we did all that work on it. Just to be sure I set it to FAST mode. But I do not think this is the problem  the point is that the iteration in user code runs so much faster than the XROM routine. Maybe there's a problem with the initial guess. Could you provide the first guesses for df=20 and p = 1E10, 0,05, 0,95 and 0,99999? Or is there a way to singlestep through the routine so that I can do this myself? The initial guess should be within approx. ±10% of the final result. Back then we also discussed a modification of the Newton iteration in that the correction term applied in each iteration should be limited to, say, ±1 or ±5%. This prevents divergence and oscillation that may otherwise occur in some cases. Dieter 

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