Orthogonal signal correction

L. Eriksson, J. Trygg, E. Johansson, R. Bro, S. Wold, Orthogonal signal correction, wavelet analysis, and multivariate calibration of complicated process fluorescence data. Anal. Chim. Acta, 2000 420, 181-195. 

Orthogonal signal correction (OSC) This method explicitly uses y (property or analyte) information in calibration data to develop a general filter for removing any y-irrelevant variation in any subsequent x data [118]. As such, if this y-irrelevant variation includes inter-instrument effects, then this method performs some degree of calibration transfer. The OSC model does not exphcitly handle x axis shifts, but in principle can handle these to some extent. It has also been shown that the piecewise (wavelength-localized) version of this method (POSC) can be effective in some cases [119]. 

S. Wold, H. Antti, F. Lindgren and J. Ohman, Orthogonal signal correction of near infrared spectra, Chemom. Intell. Lab. Syst, 44, 175-185, (1998). 

Feam, T., On orthogonal signal correction, Chemom. Inlell. Lab. Syst., 50, 47, 2000. 

Svensson, O., Kourti, T., and MacGregor, J.F., An investigation of orthogonal signal correction algorithms and their characteristics, J. Chemom., 16, 176, 2002. 

Wold, S. Antti, H. Lindgren, E Ohman, J. Orthogonal Signal Correction of Near-Infrared Spectra, "Chemomel. Intelligent Lab. Systems44,175-185 (1998). 

Bohac, M., Loeprecht, B., Damborsky, J. and Schiiiirmann, G. (2002) Impact of orthogonal signal correction (OSC) on the predictive ability of CoMFA models for the dilate toxicity of nitrobenzenes. Quant. Struct. -Act. Relat., 21, 3-11. 

Recently, orthogonal signal correction (OSC) was developed (Wold et al., 1998). OSC works in a similar manner as MSC, but differs in one important aspect. The filtering matrix is orthogonalised with respect to the dependent variable, which then assures that no information, which carries information on the dependent variable in the calibration step, is removed. 

Orthogonal signal correction A mathematical technique used to filter unwanted information from spectral data containing information of the sample of interest. OSC ensures that information relevant for the dependent variable (Y-variable) is not removed by orthogonalisation of the filter matrix with respect to the dependent variable. 

M. Padilla, A. Perera, I. MontoUu, A. Chaudry, Drift compensation of gas sensor array data by orthogonal signal correction. Chemometr. Intell. Lab. Syst. 100(1), 28-35 (2010)... 

S. Kasemsumran, Y. P. Du, K. Maruo, and Y. Ozaki, Selective Removal of Interference Signals for Near-Infrared Spectra of Biomedical Samples by Using Region Orthogonal Signal Correction, Anal. Chim. Acta, 526,193 (2004). 

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