Based on real-time estimation of noise matrix and grey clustering of state variable, filter or gain matrix is modulated so as to get an estimation of the state vector.

实时估计出系统噪声方差矩阵和量测噪声方差矩阵，对状态变量进行灰色聚类，并对滤波矩阵和增益矩阵进行实时自适应调整，计算出状态向量的递推估计值。

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The PVF allows the investor to receive an up-front payment (typically, 75-85% market value) in exchange for delivery of a variable amount of shares or cash in the future, at which time the capital gain is realized for tax purposes and the tax on the capital gain is paid.

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