Correlation and Similarity Based Methods

Another set of methods is based on correlation coefficients. The principle is diat die correlation coefficient between two successive points in time defined by 

Graph of correlation between successive points in the data in Table 6.1 

Another related aspect involves using diese graphs to select pure variables. This is often useful in spectroscopy, where certain masses or frequencies are most diagnostic of different components in a mixture, and finding these helps in the later stages of the analysis. 

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