HP Forum Archive 20

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WP34s STATs Prediction Question Message #1 Posted by Norman Dziedzic on 11 June 2011, 9:14 p.m. I either don't understand how this function works or there is a bug with it... I enter the following X & y values with Sigma+ Y,X 36,6 25,5 81,9 100,10 With each entry the wp34s shows the number of entries as expected. I do a STAT BestF then I key h-6(L.R.) and the top area says Power. X register is -6.09818323034e-14 and y register is 2. So far so good. Now I key in 4 and press f-6 for a predicted y but instead of 16 I get 8. Edited: 11 June 2011, 9:15 p.m.

Re: WP34s STATs Prediction Question Message #2 Posted by Paul Dale on 11 June 2011, 9:33 p.m., in response to message #1 by Norman Dziedzic Looks like a bug. I know I had this working at one stage :-( Fix will come. - Pauli

Re: WP34s STATs Prediction Question Message #3 Posted by Norman Dziedzic on 11 June 2011, 9:49 p.m., in response to message #2 by Paul Dale I believe it is a general fitting error as Exp mode doesn't work either. It seems the linear model is used no matter what.

Re: WP34s STATs Prediction Question Message #4 Posted by Paul Dale on 11 June 2011, 10:06 p.m., in response to message #3 by Norman Dziedzic The parameters were being calculated correctly using the appropriate model but a linear model was used after that. Must have lost the correct code somewhere along the line :-( Updated version is in subversion now. - Pauli

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