经验似然回归模型拟合优度检验:纠偏方法与应用

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"回归模型的经验似然拟合优度检验,吴鑑洪,许王莉,经验似然是一个强大的统计工具,用于检验经典参数回归模型和时间序列自回归模型。文章提出了一种纠偏方法,调整残差以实现渐近卡方分布的检验,且该检验尺度不变,无需估计渐近方差,提高了检验功效。同时,针对多个备择假设,可以构建渐近分布自由的极大极小检验。模拟研究和实际数据分析验证了该方法的有效性。关键词包括回归模型、自回归模型、经验似然、拟合优度和极大极小检验。" 回归模型和经验似然方法是统计分析中的重要工具,用于评估数据与理论模型之间的匹配程度。经验似然(Empirical Likelihood,EL)是一种非参数统计方法,它基于观察到的数据构造似然函数,而无需对数据分布的特定形式做出假设。这种方法在处理复杂模型和大量参数时特别有用,因为它能够提供类似于最大似然估计的性质,但对模型的假设较为宽松。 在回归模型中,拟合优度测试是用来评估模型对数据的适应性的统计检验。传统的经验似然方法在直接使用残差构造统计量时,并非渐近分布自由,这意味着检验结果会受到数据分布的影响。吴鑑洪和许王莉的研究中提出了一种新的纠偏方法,通过对残差进行调整,使得由此构建的检验统计量在大样本情况下遵循卡方分布。这样的改进有助于减少对数据分布的依赖,增强检验的稳健性。 该纠偏方法的一个关键优点是其尺度不变性,即检验不依赖于模型的渐近方差估计。在许多统计检验中,需要估计模型的方差,这可能导致估计误差,特别是在备择模型下。由于这种新的检验方法不需要估计这些方差,因此可以避免这种潜在的问题,从而提高检验的功效,即检测到真实模型与假设模型之间差异的能力。 此外,对于存在多个备择假设的情况,该方法可以用来构建渐近分布自由的极大极小检验。这是一种优化策略,旨在找到所有备择假设中最不利于零假设的那个,从而增强检验的敏感性。通过模拟研究和实际数据的应用,作者证明了这个新方法在各种情况下的有效性和实用性。 总结起来,"Empirical Likelihood Goodness-of-Fit Tests for Regression Models"这篇论文介绍了一种改进的经验似然方法,用于回归模型和自回归模型的拟合优度检验。该方法通过纠正残差,实现了渐近分布自由的卡方检验,增强了检验的稳健性和功效,尤其适用于多备择假设的场景。这项研究为统计学界提供了更高效、更灵活的模型检验工具。

Please revise the paper:Accurate determination of bathymetric data in the shallow water zone over time and space is of increasing significance for navigation safety, monitoring of sea-level uplift, coastal areas management, and marine transportation. Satellite-derived bathymetry (SDB) is widely accepted as an effective alternative to conventional acoustics measurements over coastal areas with high spatial and temporal resolution combined with extensive repetitive coverage. Numerous empirical SDB approaches in previous works are unsuitable for precision bathymetry mapping in various scenarios, owing to the assumption of homogeneous bottom over the whole region, as well as the limitations of constructing global mapping relationships between water depth and blue-green reflectance takes no account of various confounding factors of radiance attenuation such as turbidity. To address the assumption failure of uniform bottom conditions and imperfect consideration of influence factors on the performance of the SDB model, this work proposes a bottom-type adaptive-based SDB approach (BA-SDB) to obtain accurate depth estimation over different sediments. The bottom type can be adaptively segmented by clustering based on bottom reflectance. For each sediment category, a PSO-LightGBM algorithm for depth derivation considering multiple influencing factors is driven to adaptively select the optimal influence factors and model parameters simultaneously. Water turbidity features beyond the traditional impact factors are incorporated in these regression models. Compared with log-ratio, multi-band and classical machine learning methods, the new approach produced the most accurate results with RMSE value is 0.85 m, in terms of different sediments and water depths combined with in-situ observations of airborne laser bathymetry and multi-beam echo sounder.

2023-02-18 上传