The non-parametric models of the unit-step response and frequency response and the dynamic performance index of both in time domain and in frequency domain are also given in this paper.
文中还给出了单位阶跃响应和频率响应两种非参数模型，以及时间域和频率域的动态性能指标。
It is more reasonable that the dynamic performance index both in frequency domain and in time domain should be calculated from model calculated frequency response and unit-step response.
由参数模型计算的阶跃响应与频率特性上计算时域与频域的动态性能指标才比较合理。
The stock index is deeply influenced by reducing the stamp tax in a short time, but that influences has weaken step by step;
印花税下调在短期内对大盘股指产生显著影响，但这种影响随时间的推移而逐渐减弱；
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