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Nonlinearity measures: a case study

H. N. Linssen

Statistica Neerlandica, 1975, vol. 29, issue 3, 93-99

Abstract: Summary An important problem in applied statistics is fitting a given model function f(β) with unknown parameters β to a data vector y. Minimizing the residual sum of squares provides the least squares estimates of β. If f(β) is linear in β the precision of these estimates is well‐known. In a nonlinear case approximate (though asymptotically exact) confidence statements can be made. Beale [1] introduced measures of nonlinearity which can be used to indicate when approximate confidence statements are appropriate. Guttman and Meeter [2] showed that in some, severely nonlinear, cases Beale's measures do not give the right indication. In this paper two new nonlinearity measures are introduced and their use is illustrated on a practical problem described by Witt [3]. A more detailed discussion of the theoretical background can be found in references [1] and [2].

Date: 1975
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https://doi.org/10.1111/j.1467-9574.1975.tb00253.x

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