A cubic spline extension of the Durbin-Watson test
Durbin–Watson 检验的三次样条扩展AI 解读 ↓
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Durbin–Watson 检验的三次样条扩展AI 解读 ↓
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We propose a new test for model misspecification in linear regression, based on a measure of ‘smoothness’ of the regression residuals. This ‘curvature statistic’ is related to a property of cubic splines and leads to a convenient, powerful test for patterns. The distribution of the curvature statistic may be derived from assumptions of normality. For equally spaced data, the calculations are simplified and a table of significance points of the distribution is given. Smoothness considerations also lead to a natural generalization of the Durbin–Watson or mean-square successive differences statistic for unequally spaced observations. This generalized mean-squared successive differences statistic arises when linear splines are substituted for cubic splines in the development of the curvature statistic. The power of the curvature statistic is investigated by simulation. Compared to several other commonly used tests for patterns, the curvature test is shown to be more powerful where noise levels are small and the complexity of the underlying pattern is moderate. The calculation and use of this statistic is illustrated on a problem involving nonlinear regression residuals.