Which one of the following is the most appropriate as a definition of R2 in the context that the term is usually used?
A) It is the proportion of the total variability of y that is explained by the model
B) It is the proportion of the total variability of y about its mean value that is explained by the model
C) It is the correlation between the fitted values and the residuals
D) It is the correlation between the fitted values and the mean.
Correct Answer:
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