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Plot of x-squared versus Pg
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The plot shows C2 versus Pg for a data set. Listed are the centroid (in green) and its error (upper right in red) calculated from s/N.

We can also estimate the error in Pg from values of Pg when C2 = C2min+1.

Vary Pg (move the blue square with the mouse) to find values of e (m - mmin) when C2 = C2min+1.

How similar is the value you get when compared with the listed 'Error'?

Statistical uncertainty decreases indefinitely as 1/N. However, in general other factors will also cause the peak position to vary, e.g. variations in amplifier gain.

 

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1999, 2000 The University of Liverpool, Department of Physics

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