In the Linear menu, select the linear model type:
E = Alpha, a constant model, where y(x)=constant.
E = Alpha + Beta * C, a linear model, where y(x)=intercept+slope*x.
E = Alpha + Beta * C + Gamma * C^2, a quadratic model, where y(x)=A0+A1*x+A2*x^2.
In the above equations, y is the dependent variable and x is the independent variable.
Refer to the “Residual error model options” section for descriptions of the Residual Error fields.