自协方差

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[数] auto-covariance
所谓序列的平稳性是指一个序列的均值、差（variance）（mean）方和自协方差（auto-covariance）是否稳定。如果一个时间序列具有稳定的均值、方差和自协方差，则这个序列就是稳定的，否则就是非稳定的。
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auto covariance
... assayblock covariance 化验质块段协方差 auto covariance 自协方差 blockblock covariance 岩体对岩体协方差 ...

短语

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本文提出了一种新型的并行三维纹理综合算法，即：基于图象的自协方差函数，均值和方差的纹理综合方法。
A new 3-d texture synthetic method is proposed in this paper, i. e., the parallel 3-d texture synthetic algorithm based on autocorrelation parameters, the mean and the variance of texture images.
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本文的目的在于，对于线性平稳时间序列的样本、自协方差、自相关和偏相关函数的渐近性质，给出一个比较系统的描述。
The aim of this paper is to give a systematic account of asymptotic properties of the sample autocovariance, autocorrelation and partial autocorrelation functions of linear stationary time series.
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表明：基于氨基酸组成和有偏自协方差函数为特征矢量的BP神经网络预测蛋白质二级结构含量的方法可有效提高预测精度。
It is shown that the BP neural network method combined with the amino-acid composition and the biased auto-covariance function features could effectively improve the prediction accuracy.

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