Firstly, the modified Y-W equation was used to estimate the parameters of the time-varied auto-regressive part and the error signal;

首先，采用改进的Y—W方程对TVARMA模型时变自回归部分系数进行估计，并计算残差序列；

youdao

x Well, we know how to compute partial w over partial x y or partial w over partial y, which measure how w changes if I move in the direction of the x axis or in the direction of the y axis.

我们知道如何计算∂w/∂,或者∂w/∂,这衡量了我在x轴,或者y轴方向上移动时，w的变化。

youdao

So, just to get you used to this idea, I'm going to draw a level surface of a function of three variables OK, so it's a surface given by the equation w of x, y, z equals some constant c.

为了令你们习惯于这个想法，我画一个三变量函数的等值面,这是一个平面,由函数w=c给出的。

youdao

But that's w-a-a-y-y-y too little money.

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