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The error in a set of observations is usually expressed in terms of the Standard Deviation of the measurement set. This implies that for a given plotted point, you have several measurements.
In 1982 the mint mark was accidentally left off a set of Philadelphia dime dies. Numismedia lists the following retail values for this error, as of 06/2009: Worn condition - $32 Moderately worn - $52 Slightly worn - $60 Almost no wear - $85 Uncirculated - $120+
1,7,1
The standard proof set and the Prestige set both are known to have this error coin in them. With retail values of $6,500.00 each
That all observations are exactly the same.