(MSE((Overscript[y, ˆ]))=(1/N)(∑_(i=1)^N)((((Subscript[y, i])-(Subscript[(Overscript[y, ˆ]), i])))^2)Example   Equation   1RMSE((Overscript[y, ˆ]))=(Sqrt[(1/N)(∑_(i=1)^N)((((Subscript[y, i])-(Subscript[(Overscript[y, ˆ]), i])))^2)])Example   Equation   2MAD((Overscript[y, ˆ]))=median(\[LeftBracketingBar]y-(OverHat[y])\[RightBracketingBar])Example   Equation   3(R^2)((Overscript[y, ˆ]))=1-((MSE((Overscript[y, ˆ])))/(var(y)))Example   Equation   4)