Construction of the calibration model

The choice of the calibration method is dictated by the nature of the sample, the number of components to be simultaneously determined, the a priori knowledge about the system studied and available data on it. The most salient features of the different types of cahbration methods are described below. 

Multiple linear regression is the usual choice with filter instruments and is also used with those that record whole spectra. It is an effective calibration approach when the 

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