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    Re: R: Averaging
    From: George Huxtable
    Date: 2004 Oct 18, 23:43 +0100

    Federico Rossi wrote, about averaging an odd number of observations-
    >The explanation I've found for this recommendation is that this way you
    >can consider the central value of the odd series (i.e. the so called
    >median) which is definitely less affected by abnormal values than the
    >average value.
    Selecting a median that way seems to be an alternative to averaging. It's a
    rather extreme case of discarding outliers, in that it discards EVERYTHING
    but the one median observation.
    I can see that it might be usable (if not ideal) for dealing with a
    quantity that fluctuates in a random manner. But I don't see how you would
    apply that technique to a quantity that was changing systematically, in the
    way that observed altitudes change rather steadily with time (either
    increasing or decreasing), with a bit of random scatter superimposed.
    contact George Huxtable by email at george---.u-net.com, by phone at
    01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
    Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.

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