Figure 3: Risk, which greatly contributes to variance and unpredictability, is reduced over time in an iterative project.

图3：风险，主要代表了变化性和不可预测性，在项目的迭代中随着时间而降低。

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Hence, the variance diminishes over time due to collaborative interaction on new knowledge acquisition.

因此，由于在新知识的获取方面进行合作交流，方差随着时间减少了。

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However, for the composite load has the characteristics of complex composition, random time variance and spread over different area, its exact mathematics model is still not built up.

然而，系统中的综合负荷，由于具有构成复杂、随机时变、地域分散等特点，其准确的数学模型一直没有建立起来。

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Its called a liquidity premium and its variance over time drives both difference in volatility and average return between investment vehicles.

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Cost of carry on my bond portfolio of high yield paper is also minimal, but shows a net positive variance of over 500 basis points.

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Mr Sides's findings may also reflect a phenomenon identified by Moody's Analytics: over time, states' economic performance has converged, and the variance between their growth rates now matches the lowest in 70 years.

ECONOMIST: The economy