Parallel Factor Analysis: Trilinear Data

In this chapter the processing of trilinear three-way data is discussed, using the most popular algorithm for this task, i.e., parallel factor analysis. The MATLAB graphical interface software MVC2 is employed for data processing, including analyte determination in samples where unexpected constituents occur (i.e., exploiting the second-order advantage). If the chapter reading is followed by simultaneously running the software as indicated, several important aspects of the multiway calibration procedure of second-order data for analyte quantitation can be easily grasped: (1) the process of decomposing the three-way array of signals, (2) the selection of the analyte profile among all the retrieved profiles in the different data modes, (3) the construction of the so-called pseudo-univariate calibration plot for the analyte of interest, and (4) the prediction of the concentration of the analyte in a given sample from the latter plot with its corresponding analytical figures of merit.

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