From: "Vladimir Galogaza" 
To: "ATM shore" 
Reply-To: "Vladimir Galogaza" 


James,

>.  I'll leave the exact standard deviation calculation over
>the entire set of tests as an exercise for the list ;)

(How nice of you.)

In working on the exercise I stumbled on the following question.

In tables of results you gave 1 zone radius and 4 readings for each zone. I
checked mean zonal standard deviation ( using R) and it is in full
agreement
with your figure (for 7 zone test). But final results (surface errors) are
calculated from the sets of two pairs of measurements ( longitudinal KE
position and corresponding zone radius) They are two independent (!)
variables and you gave 4 measurements for respective longitudinal KE
positions but one zonal radius for all 4 measurements.
If I understand your method well, (not very likely), you should give 4
longitudinal KE
positions paired with 4 zonal radii as found by robo. ( Except if all four
measurements
always result in  same zonal radius)

Robo is not calculating zonal radii from longitudes, it is measuring them ( I think).
So both measurement errors should be known ( reported) because their errors
 will go into final calculations ( only James knows to what extent)
and contribute to  final error budget.

Vladimir.

PS
Amount of data you put on your "2ndTry" site is terrific.

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