I mean, in the beginning I had this relation that was an equationofdegree three. You don't really want to solve your equation for the dependent variable usually.
我的意思是，在开始有一个关系，这个关系是一个三元方程，一般地，不会为了求因变量而求解一个方程。
2
Second-degree polynomials equationof maize(Zea Mays L. ) grain yield with both planting density and nitrogen fertilization was established by means of regression analysis.
本文从不同种植密度和施氮量对玉米籽粒产量的影响，建立了二次多项式回归方程。
3
Moreover, the fitting degreeof curvilinear regression equation is tested by correlation index, in stead of correlation coefficient which has been unsuitably used for testing in similar works.