Multivariate calibration methods in near infrared spectroscopic analysis

Near infrared (NIR) spectroscopy has been demonstrated as a powerful technique for both qualitative and quantitative analysis of complex systems in various fields. Calibration, however, is one of the important techniques needed to ensure the quality and practicability of the analyses. In this mini-review, recent developments in multivariate calibration methods for NIR spectroscopic analysis, including non-linear approaches and ensemble techniques, are briefly summarized. The advantages and disadvantages of these methods are compared and discussed critically.