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    Re: Bias and cocked hats
    From: Dave Walden
    Date: 2007 Apr 18, 17:54 -0700

    
    
    > > For three equally spaced observations
    >
    > Is this a sound assumption?
    
    Vol 1 of the Air Almanac can provide a good set of 3 for any time any
    place.  It's a not "unreasonable" assumption and provides an
    interesting and useful result.  I would not expect too much
    sensativity.  Try some runs.
    
    
    >
    >  ... and independent normally distributed random errors
    >
    >
    >
    > Is this assumption of only random errors reliable? What happens if some
    > systematic error is also involved?
    
    It's again a reasonable assumption and I would estimate the first
    order approximation.
    
    If by systematic error you mean something other than a constant bias,
    I suppose there could be an error proportional to altitude for
    example.  But for measurements between 30 and 60 or so I would think
    the chance of such an error being significant is unlikely.  And even
    more unlikely to be large and unknown.
    
    
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