Traditional methods for experiment design and analysis is to designorthogonal experiment first, and then make regression analysis and variance analysis to search the optimal technological condition.
T. ma was studied on the base of other studies, the experiment adopted with the combination design of orthogonal and quadratic regression equation.
采用三元二次回归正交组合设计，研究了氮、磷、钾三因素五个水平对湖北麦冬产量的影响。
3
At realm of surface roughness of machined surface, forecast mathematical model is set up by using quadratic regressionorthogonaldesign between NC turning parameter and machined surface.