Multivariate Calibration for Spectral Analysis Based on P-Spline Signal Regression with Net Analyte Signal.

The article discusses the use of P-spline signal regression (PSR) with net analyte signal (NAS) method in developing a highly precised quantitative calibration model. It mentions that the NAS approach is important to develop a basis coefficient vector through a projection matrix. According to the authors, the matrix is essential to compute and predict the outcome of NAS.