If @{affine} is false, R^2 is the uncentered version of the coefficient of determination; that is the proportion of the sum of squares explained by the model.
Baldin eta @{afina} faltsua bada, R^2 mugatze-koefizientearen bertsio zentratu gabea da; hau da, ereduan azaldutako karratuen baturaren proportzioa.