question: returns the coefficient of determination r2 . concode_field_sep double R2 concode_elem_sep double svar concode_elem_sep double intercept concode_elem_sep double svar1 concode_elem_sep double svar0 concode_elem_sep double slope concode_elem_sep int N concode_field_sep double intercept concode_elem_sep double predict concode_elem_sep String toString concode_elem_sep double slope concode_elem_sep double interceptStdErr concode_elem_sep double slopeStdErr
target: double function ( ) { return R2 ; }