Recently it has been correctly pointed out that because linear regression of two variables is not symmetric, regression of log L on M cannot be used to estimate magnitude (M) from fault rupture length (L). It must be stated further, however, that least-squares regression treating L as error free is also incorrect. Indeed, to date no completely correct regression analysis of M or log L has been published. Full treatment requires geologists to assess uncertainties and to assign weights to field observations of L.

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