Conversion Relationships
Conversion Relationships : Statistical relationships between parameter data of similar kind, e.g., different types of magnitude estimates. Such relationships are used for converting, with some uncertainty, one type of data into the other one, e.g., body and/or surface-wave magnitude values into the equivalent moment-magnitude values. This is common practice in efforts to create homogeneous - with respect to magnitude - earthquake catalogs. Usually, conversion relationships are derived via least-square standard regression analysis, although for data afflicted with comparable measurement and initial errors, which are the case for many types of magnitude data, orthogonal regression relationships are preferable. See, e.g., Castellaro and Bormann (2007)
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