When the sample size is great, QIF approach shows that the selection of working correlation is same to the selection of unbiased estimating equation.

当样本量较大时，QIF方法表明工作相关阵的选择等价于无偏估计方程的选择。

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According to the special structure of unitary code, it is very simple to analyze the effect of fading correlation from the equation of PWEP.

鉴于酉空时码的独特结构，在差错概率公式中可以很容易地分析衰落相关系数矩阵带来的影响。

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Moreover, the fitting degree of curvilinear regression equation is tested by correlation index, in stead of correlation coefficient which has been unsuitably used for testing in similar works.

此外，用相关指数来检验曲线回归方程的拟合程度，而不采用在类似的研究中用相关系数来检验曲线回归这一不合适的方法。

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Add to the equation the high correlation in the stock market and high volatility, and suddenly the rule of thumb of investing 60% of your money in stocks and 40% in bonds no longer provides the returns they once did.

FORBES: Get 'Real' and Protect Your Money