index estimation的用法和样例：
例句
- The estimation of electrical harmonic parameters by using the quasi-synchronization and interpolated FFT are introduced.
介绍了加窗插值法和准同步法在电力系统谐波参数估计中的应用。 - Collocation is usually applied to deal with the parameter estimation,which contains the trend parameters and stochastic parameters.
拟合推估常用于解决既含有倾向性参数又含有随机参数的参数估计问题。
