Proton-proton elastic scattering using 201-and 400-GeV/c extracted beams at Fermilab has been measured in the region 4.9

The standard least-squares method should not be applied to those rather common situations where both dependent and independent variables have errors. Instead, the effective variance method should be used. This method and the standard least-squares method are presented, along with a derivation of the general form of the effective variance method.

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