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Gateway to Spectroscopy > Data Acquisition > Calibration > Correlation coefficient

Correlation coefficient

[Correlation coefficient][Sxy]

where r may vary from -1 to 1, with 1 being a perfect correlation with y increasing (+) or decreasing (-) with x, and 0 being no correlation. Special care is required when using this parameter because it is very dependent on n, the number of calibration samples. For example, an r value of 0.96 with 5 points is comparable to an r value of 0.56 with 20 points. It is therefore better to use confidence levels or only compare r values for the same number of points.