A distribution-free alternative to least-squares regression and its application to Rb/Sr isochron calculations

Vugrinovich, R. G.

Abstract:

A distribution-free estimator of the slope of a regression line is introduced. This estimator is designated Sm and is given by the median of the set of n(n - 1)/2 slope estimators, which may be calculated by inserting pairs of points (Xi, Yi)and (Xj, Yj)into the slope formula Si = (Yi - Yj)/(Xi - Xj), 1 ??? i < j ??? n Once Sm is determined, outliers may be detected by calculating the "residuals" given by Ri = Yi - SmXi where 1 ??? i ??? n, and chosing the median Rm. Outliers are defined as points for which |Ri - Rm| > k (median {|Ri - Rm|}). If no outliers are found, the Y-intercept is given by Rm. Confidence limits on Rm and Sm can be found from the sets of Ri and Si, respectively. The distribution-free estimators are compared with the least-squares estimators now in use by utilizing published data. Differences between the least-squares and distribution-free estimates are discussed, as are the drawbacks of the distribution-free techniques. ?? 1981 Plenum Publishing Corporation.

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Article

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70011926

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Vugrinovich, R. G.

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454

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English

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Journal of the International Association for Mathematical Geology

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A distribution-free alternative to least-squares regression and its application to Rb/Sr isochron calculations; 1981; Article; Journal; Journal of the International Association for Mathematical Geology; Vugrinovich, R. G.