[HP12C] Angular coefficent from linear regression off by 1

01212019, 08:10 PM
Post: #31




RE: [HP12C] Angular coefficent from linear regression off by 1
(01192019 05:36 PM)Albert Chan Wrote: Manual suggested method, slope = f(1)  f(0), may lose *many* significant digits, due to subtraction cancellation. OK, then let's combine a manual calculation from the stored sums for the slope and the 0 y^ method for the intercept. The latter should be exact by design as the calculator evaluates 0*slope + intercept. I assume this calculation is even done with the internal extended precision. Which leads to this program: Code: RCL 1 On exit the stack holds all relevant data: T: r Z: r Y: slope X: intercept You may replace the last ENTER with RCL 1 X<>Y, so that T finally holds the number of data points. Dieter 

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