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Coefficients of Correlation, Alienation, and Determination

The coefficient of correlation evaluates the similarity of two sets of measurements (i.e., two dependent variables) obtained on the same observations. The coefficient of correlation indicates the amount of information common to the two variables. This coefficient takes values between–1 and + 1 (inclusive). A value of + 1 shows that the two series of measurements are measuring the same thing. A value of–1 indicates that the two measurements are measuring the same thing, but one measurement varies inversely to the other. A value of 0 indicates that the two series of measurements have nothing in common. It is important to note that the coefficient of correlation measures only the linear relationship between two variables and that its value is very sensitive to outliers.

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