Theobromine
Partial least squares regression
Linear discriminant analysis
Principal component analysis
High-performance liquid chromatography
Caffeine
Chemistry
Fourier transform infrared spectroscopy
Chemometrics
Attenuated total reflection
Chromatography
Food science
Mathematics
Infrared spectroscopy
Analytical Chemistry (journal)
Biology
Statistics
Organic chemistry
Physics
Quantum mechanics
Endocrinology