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    Re: Averaging
    From: Jim Thompson
    Date: 2004 Oct 19, 08:48 -0300

    > -----Original Message-----
    > From: Navigation Mailing List onBehalf Of Peter Fogg
    > Getting back to nav, the process for averaging sights is simple
    > and effective. As many sights as possible
    > taken over about 5 minutes of time are plotted. Time is the
    > horizontal axis, observed altitude on the
    > vertical. The slope of this group of sights either rises; obs to
    > the east, or descends; to the west. This slope
    > is then compared to a calculated line, which is then best fitted
    > to the slope of sights. Any extreme outliers
    > are disregarded (probably best, although it goes against ideal
    > statistical practice).
    > Simple and effective. I'm always vaguely surprised its a
    > technique not more widely known.
    
    Microsoft Excel makes it drop-dead easy to draw such a graph and, with a
    mouse click, to generate the equation for the line of best fit.  If a laptop
    is at hand.
    
    Jim Thompson
    jim2{at}jimthompson.net
    www.jimthompson.net
    Outgoing mail scanned by Norton Antivirus
    -----------------------------------------
    
    
    

       
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