The parameter estimation problem to the invertible vector moving average (ma) model essentially is a matrix spectral factorization problem.

可逆的向量滑动平均(MA)模型参数估计问题本质上是一个矩阵谱分解问题。

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The daily chart shows a well-established uptrend that was tested, along with the 50-day moving average (MA) on the mid-March drop.

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If this level is broken, then the March lows and the rising 200-day moving average (MA) are now in the 1250 area.

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Some technicians are concerned about the Shanghai Composite, as its 50-day moving average closed below the 200-day MA last week.

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