for parametric models,a set of orthogonal functions can also be used to pre-processing of input and output signals instead of the differential operation in continuous-time system.
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In order for parametric models to have any validity they must be based on or proven using actual project data.
为了参数的模型具备有效性，他们就必须基于或者被证明为是使用精确的项目数据的。
For estimating the software error intensity of parametric models, weighted least-square (WLS) estimate is suggested for the first time.
对于参数模型软体错误强度，本文首次建议加权最小平方(WLS)估计。
The randomly weighted least square estimator (RWLSE) for the parametric component in semi-parametric regression models was mainly discussed.
主要考虑了同方差型的半参数线性回归模型中参数的随机加权最小二乘估计（RWLSE）。
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