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Coefficient could have one of the following meanings:
- In mathematics, a coefficient is a constant multiplication of a function
- The mathematical term differential coefficient has been mostly displaced by the modern term derivative.
- In physics, a physical coefficient is an important number that characterizes some physical property of an object.
- In statistics, the coefficient of determination, denoted R2 and pronounced R squared, is the proportion of total variation of outcomes explained by a statistical model.
- In probability theory and statistics, the coefficient of variation (CV) is a normalized measure of dispersion of a probability distribution or frequency distribution.
- In statistics, the correlation coefficient (Pearson's r) is a measure of the linear correlation (dependence) between two variables.
- The Coefficients were an Edwardian London dining club.
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