Correlation

two or more things so related that the presence or amount of one corresponds to the presence or amount of another. For example, the percentage of peaks in a used oil infrared spectrum which match those in a new reference oil. A high correlation would imply the oils match, a low correlation would imply mixing or degradation. Another example would be the amount of dirt contamination within a system correlated to the amount of abrasive wear on the internal parts.

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