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    Re: Rejecting outliers
    From: Fred Hebard
    Date: 2011 Jan 1, 17:28 -0500

    Perhaps Peter will post his data after his sailing trip.
    
    On Jan 1, 2011, at 4:33 PM, P H wrote:
    
    > From: Fred Hebard
    >
    > Peter,
    >
    > Those are simulated data, not real data.
    >
    > Fred
    >
    > ======================================================================
    > =======
    >
    > Fred,
    >
    > Would you be comfortable with a procedure that fails in the case of
    > a simple (and yes, simulated) data set, for which you know a priori
    > what the right answer is?  Would you trust your new calculator to
    > process real data if it gave you 1+1=3 in an "artificial" test the
    > first time you use it?
    >
    > The success with examples that I provided are necessary for the
    > method to be valid; I never said it was sufficient.  You seem to
    > imply that there is no value in working with simulated data.  Quite
    > the opposite is true; you have to be able to get 1+1=2 (or, in this
    > case, computed altitude #5 close to 14) before you can even hope to
    > deal with real data with any confidence.
    >
    > For example, before I successfully processed real-life meridian
    > transit data (long ago) and the recent ex-meridian data set, I put
    > the parabolic-fitting procedure through the simplest simulated test
    > of having three non-colinear points (image attached).
    >
    > If real data becomes available this time around, once again I'll be
    > happy to work with it and make adjustments in the algorithm, if
    > necessary.
    >
    >
    > Peter Hakel
    >
    >
    > 
    
    
    
    
    

       
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