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Re: Linear regression and other tools
From: Bruce Cutting
Date: 2018 Oct 14, 12:45 -0600

Sure - I agree that the data will change depending on the declamation. But how would that affect the regression calculations - it would affect the resulting 2nd order curve coefficients but the calculations would remain the same - true ??? The accuracy or the resulting average would also be affected - if, in fact, the curve is of higher order than 2, the error of the average would be expected to be larger. On Sat, October 13, 2018 21:01, Ron Jones wrote: > The length of time prior to or after meridian transit that the rate of > change in the altitude of a body can be considered linear is strongly > influnced by the difference in the bodies declinaltion and the latitude > of the observer. For example on October 13 2018 when the Sun's > declination is approximately 8 deg. South, consider the Sun's altitude > vs time as viewed from latitudes 10N, 20N, 40N, 60N & 80N (see attached > PDFs). > Ron 48N 123W > > > [plain text auto-generated] > ---------------------------------------------------------------- > NavList message boards and member settings: https://navlist.net/NavList > Members may optionally receive posts by email. > To cancel email delivery, send a message to NoMail[at]navlist.net > ---------------------------------------------------------------- > ---------------------------------------------------------------- > > > > Attached File: https://navlist.net/imgx/10N-Hc-of-Sun-vs-time.pdf > Attached File: https://navlist.net/imgx/20N-Hc-of-Sun-vs-time.pdf > Attached File: https://navlist.net/imgx/40N-Hc-of-Sun-vs-time.pdf > Attached File: https://navlist.net/imgx/60N-Hc-of-Sun-vs-Time.pdf > Attached File: https://navlist.net/imgx/80N-Hc-of-Sun-vs-time.pdf > > > > : > https://navlist.net/m2.aspx/Linear-regression-other-tools-RonJones-oct-201 > 8-g43067

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