Non-linear calibration models for near infrared spectroscopy.

Highlights: [•] We present a comprehensive comparative study of nonlinear calibration techniques. [•] The methods are connected in terms of traditional calibration by ridge regression. [•] Three real-life near infrared (NIR) data sets are used for comparison of the methods. [•] Different practical aspects of the methods are discussed for spectral analysis. [ABSTRACT FROM AUTHOR]