To: atm{at}shore.net
From: Jim Burrows 
Reply-To: Jim Burrows 


At 18:01 2003-08-10 +0530, Ulhas Deshpande wrote:

>The SD of all the
>twelve sets for each zone seems to be quite high being of the order of 0.39
>mm (min) to 0.59 mm(max). Is this too large? Does this mean that the
>readings taken are not consistent? ;-((

If you put in the average of all 12 readings, the reading SD would be
(worst case) .59/sqrt(12) = .17 mm, which is big, but not horrible -
Texereau sez, p. 85, the careful beginner can get ñ.005", reading SD
of .073 mm.  Sixtests will tell you the resultant SD(RMS); 6 zones should
help a lot.

         -- Jim Burrows
         -- mailto://burrjaw{at}earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84)

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