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    Re: Linear regression and other tools
    From: Ron Jones
    Date: 2018 Oct 13, 09:00 -0700

    Dear Antoine

    You wrote
    ___________________________________________________________________________________________________________________________________________________________________________________
    "In practice and from your own experience how does your 2nd order regression perform since you seem to be using the (x2) 2nd order coefficient directly derived from the data set and not precomputed from the Observer's (approximate) environment ? (RE: Linear-regression-other-tools-Couëtte-oct-2018-g43055)

    In other words, does your 2nd order regression bring a definite practical advantage over the 1st order [linear] one ?"
    ____________________________________________________________________________________________________________________________________________________________________________________

    For a string of sights taken near meridian transit (+/- 10 minutes) the second order regression may provide a better result.  For a string of sights taken over a short time before & after meridian transit use the Meridian Transit worksheet which uses second order regression; and calculates the time and sextant altitude associated with meridian transit (see attached PDF)

    Ron ..... 48 N  123 W

    File:
    Meridian-Transit-Worksheet.pdf
       
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