R squared value Person: Jie Zheng, Oliver He A quantitative confidence value that indicates how well data points fit a statistical model - sometimes simply a line or curve. It is a statistic used in the context of statistical models whose main purpose is either the prediction of future outcomes or the testing of hypotheses, on the basis of other related information. It provides a measure of how well observed outcomes are replicated by the model, as the proportion of total variation of outcomes explained by the model. R squared http://en.wikipedia.org/wiki/Coefficient_of_determination coefficient of determination quantitative confidence value