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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The comparison result of computation value and measure value shows that their deviation is within 3% for low load ratio, and has increasing tendency for high load ratio, but it is within 5%.

对于较小的负荷变化率，压力计算值与测量值偏差小于3%，而较大的负荷变化率时，偏差有增大趋势，但其误差小于5%。

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One method was getting the maximum and the minimum of the structural performance function by optimization, and then calculating the ratio of mean-value to deviation of the performance function.

一种方法是先优化得到结构功能函数的最大和最小值，再计算功能函数均值和离差的比值；

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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.

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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