Capturing spatiotemporal dynamics of Alaskan groundfish catch using signed-rank estimation for varying coefficient models

Capturing spatiotemporal dynamics of Alaskan groundfish catch using signed-rank estimation for varying coefficient models
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使用不同系数模型的符号秩估计捕获阿拉斯加底鱼捕捞量的时空动态

DOI:
10.1080/02664763.2021.1889996
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发表时间:
2021
影响因子:
1.5
通讯作者:
Abebe, A.
Abebe, A.
中科院分区:
数学4区
文献类型:
--
作者:
Correia, H. E.;Abebe, A.

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Varying coefficient models (VCMs) are commonly used for their high degree of flexibility in modeling complex systems. Many applications in fisheries utilize VCMs to capture spatial variation in populations of marine fishes. All of these applications use the penalized least squares method for estimation. However, this approach is known to be sensitive to non-normal distributions and outliers, a common feature of ecological data. Robust estimation methods are more appropriate for handling noisy and non-normal data. We present the application of a signed-rank-based procedure for obtaining robust estimates in VCMs on a fisheries dataset from the North Pacific Ocean. We demonstrates that the signed-rank-based estimation method provides better fit and improved prediction in comparison to the classical likelihood VCM fits in both simulations and the real data application, particularly when the distributions are non-normal and may be misspecified. Rank-based estimation of VCMs is therefore valuable for modeling ecological data and obtaining useful inferences where non-normality and outliers are common.
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