Moreover, the profit of contrarian strategies is significantly improved when the mean-standard deviation ratio optimization allocation is used.

均值-标准差比率优化配置可以显著地提高反向策略的赢利。

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Comparing the ratio of standard deviation to the average for these two distributions shows that they are similar.

把这一标准差和两次的平均值相比较，我们就能发现他们很相像，（因为我们知道重力加速度是个常数）。

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According as compare of voltage deviation and its variable ratio, optimal control of voltage and current is realized with querying fuzzy control sheet and adjusting adverse variable pulse width.

比较电压偏差及其变化率，查询模糊控制表，调节逆变脉宽，可实现电压及电流的理想控制。

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In the chart below, the potential for profit can be identified when the price ratio hits its first or second deviation.

FORBES: The Secret To Finding Profit In Pairs Trading

There have been just 50 occasions since 1973 when this ratio was greater than one standard deviation from that average, as it is now.

FORBES: Dividend Payment Downtrend

And when the ratio is as low as 0.911, one standard deviation, the market is signaling that small cap is relatively cheap and should outperform in the coming months.

FORBES: When large cap is relatively cheap it will outperform small cap