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## curvature

curvature In nonlinear regression analysis, measures of curvature were proposed by D. Bates and D. Watts as a means of assessing the reliability of certain linear approximations. Curvature has two components: parameter-effects curvature, which can be reduced by suitable transformations of the parameters, and intrinsic curvature, which represents the essential aspect of nonlinearity. Estimation of these measures requires the second derivatives of the expectation functions in the model.

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## curvature

cur·va·ture / ˈkərvəchər; -ˌchoŏr/ • n. the fact of being curved or the degree to which something is curved: spinal curvature. ∎ Geom. the degree to which a curve deviates from a straight line, or a curved surface deviates from a plane. ∎  a numerical quantity expressing this.

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"curvature." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

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"curvature." The Oxford Pocket Dictionary of Current English. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/curvature-0

## curvature

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