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.
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异质性高维分位数回归的全局推断
Quantile regression has received considerable attention in high dimensional methodology due to its robustness and ability to accommodate heteroskedasticity. Despite this attention, current inferential methods for high dimensional quantile regression have significant limitations---only testing significance, testing at a single quantile at a time, or assuming homoskedasticity. To generalize the inferences that can be drawn in high dimensional quantile regression, we introduce…
Uniform confidence bands are widely used in empirical analysis for uncertainty qualification of nonparametric inference of unknown functions. A variety of simple implementation methods, including multiplier bootstrap, have been proposed and theoretically justified. However, an implementation over a literally continuous index set is generally computationally infeasible, and practitioners therefore compute the critical value by evaluating the statistic on a finite evaluation…
We study nonparametric inference for a continuous-treatment causal dose-response curve and its first derivative under unmeasured confounding, using treatment- and outcome-inducing proxies. We establish a proximal doubly robust pseudo-outcome whose conditional mean given treatment equals the dose-response curve whenever either bridge function is correctly specified. Their (smoothed) efficient influence function representations lead to cross-fitted local-polynomial estimators…