[WP34S] ChiSquare Distribution

01142014, 11:05 PM
Post: #19




RE: [WP34S] ChiSquare Distribution
(01142014 10:07 PM)Paul Dale Wrote: The problem I fixed added a +/ at the end if p<.5 Thank you. But as far as I can tell the new code contains a substantial error: For p in the center (i.e. between 0,23 and 0,77) the estimate uses the code following label qf_q_mid. Then the estimate is compared with two threshold values (0,04 and 4E9), and finally label qf_q_signfix is reached where the sign gets adjusted. But at this point X does not hold the absolute value of the estimate (R_ABSZ), but 4E9 (!). The estimate is in Y. As far as I can tell there is a X<>Y, Roll down or RCLÂ R_ABSZ missing. This error must be relatively new since otherwise the Normal quantile would not be able to return exact results  the quantile algorithm uses at most two iterations, and this only works if the initial estimate is sufficiently accurate. Or do I miss something here? Dieter 

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