Smoothing parameter selection methods for nonparametric regression with spatially correlated errors

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Cross-Validation for Correlated Data (2019, methodology): “Several papers (Altman 1990; Francisco-Fernandez and Opsomer 2005) consider nonparametric modeling with correlated errors and propose versions of CV and generalized crossvalidation (GCV) which account for this correlation, for the purpose of selecting bandwidth for estimating the trend of time…”