HP Forum Archive 13

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regression - logarithmic curve fit Message #1 Posted by pieropiero on 2 Oct 2003, 9:37 a.m. From the HP-67 standard pack I have converted into qbasic language the linear, power, and exponention formulas as mentioned in pages 03-02 thru 03-04. They work alright but I am unable to make use of the logarithmic regression curve fit. This will not give the correct results. I do not need the qbasic program lines but I would like to get the correct logarithmic regression formula. Any help will be welcomed. I have some spare HP items, such as HP-41 complete with card reader and printer. Anyone interested?

Re: regression - logarithmic curve fit Message #2 Posted by Tizedes Csaba on 3 Oct 2003, 7:25 a.m., in response to message #1 by pieropiero The form of the curve is: y=a+b*ln(x) , where x>0 . Csaba

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