According to the relationship between auto correlation function and its spectral density, a new type of decision tree method based on signal analysis theory is proposed in this paper.

该文根据自相关函数与谱密度函数之间的对应关系，提出了一种新的基于自相关函数的决策树归纳学习算法。

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Meaning: The self-correlation function and power spectrum density Function of a power-typed signal compose a FT pair.

上式表明： 功率型信号的自相关函数与其功率谱密度函数构成傅立叶变换对。

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By using backward difference of space-time intensity correlation function with respect to time delay, the two-dimensional velocity vector of a moving diffuser can be measured.

利用远场时变散斑空-时强度相关函致的有限差商可以测量散射体运动的二维速度矢量。

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There is also a rebalancing that is a function of low correlation and high volatility.

FORBES: Asset Allocation and the Efficient Frontier

Some may argue that the present, wider high yield spread is a function of the low Treasury yields, but historically there has been little correlation between the spread-versus-Treasuries and nominal Treasury yields.

FORBES: Are Credit Measures Worse Now Than At The Start Of Last Recession?