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Authors: Gasperini, P.* 
Lolli, B.* 
Title: Comment on ‘Magnitude conversion problem using general orthogonal regression’ by H. R. Wason, Ranjit Das and M. L. Sharma, (Geophys. J. Int., 190, 1091–1096)
Issue Date: 2014
Series/Report no.: /196 (2014)
DOI: 10.1093/gji/ggs077
Keywords: Earthquake source observations
Statistical seismology
Computational seismology
Subject Classification05. General::05.01. Computational geophysics::05.01.04. Statistical analysis 
Abstract: The argument proposed by Wason et al. that the conversion of magnitudes from a scale (e.g. Ms or mb) to another (e.g. Mw), using the coefficients computed by the general orthogonal regression method (Fuller) is biased if the observed values of the predictor (independent) variable are used in the equation as well as the methodology they suggest to estimate the supposedly true values of the predictor variable are wrong for a number of theoretical and empirical reasons. Hence, we advise against the use of such methodology for magnitude conversions.
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