Trend filtering, a locally adaptive nonparametric smoother, is introduced to astronomy because it can denoise heterogeneous signals (smooth trends plus sharp features) better than linear smoothers.
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Trend Filtering -- I. A Modern Statistical Tool for Time-Domain Astronomy and Astronomical Spectroscopy
Trend filtering, a locally adaptive nonparametric smoother, is introduced to astronomy because it can denoise heterogeneous signals (smooth trends plus sharp features) better than linear smoothers.