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Best Answer: The correlation coefficient, r, is a measure of the linear relationship between two variables. If the data is non-linear then the correlation coefficient is meaningless. r takes on values between -1 and 1. negative values indicate the relationship between the variables is ... - read more

In cases where negative values arise, the mean of the data provides a better fit to the outcomes than do the fitted function values, ... Values for R 2 can be calculated for any type of predictive model, ... Cambridge Dictionary of Statistics ... - read more

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