Inspec keywords: ageing; least squares approximations; infrared spectra; infrared spectroscopy; regression analysis; transformer oil; paper; power transformers; data analysis; power transformer insulation

Other keywords: competitive adaptive reweighted sampling; data analytic algorithms; main insulation type; high-voltage power transformer; physical tests; condition assessment; ageing condition; analytical technique; fast response; spectral data quality; infrared spectroscopy detection; quantitative analysis model; NIRS analysis; effectively spectral information; S; oil-paper insulation; chemical tests; industrial applications; evaluation precision

Subjects: Interpolation and function approximation (numerical analysis); Other topics in statistics; Transformers and reactors