MDFA: multivariate direct filter approach implements Accuracy-Timeliness-Smoothness (A-T-S) forecast trilemma in frequency-domain; M-SSA implements A-S dilemma in time-domain; Look Ahead DFP and PCS implement A-T dilemma in time-domain. All approaches emphasize explainability (closed-form, unique and fast solutions, simple novel principles). xAI: novel explainability tool for Neural Nets applied to time series.
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