查询词典 standard deviation

The karyotype resemblance -near coefficients among the thirteen bivalves were computed according to the relative length and arm ratio of chromosomes. their average, mean square, extreme margin and standard deviation. The kindredship of thirteen bivalves were analyzed with the method of UPGMA.

方法］根据染色体相对长度、臂比，以及它们的平均值、方差、极差、标准差等参数，计算了13种双壳贝类之间的核型似近系数，用UPGMA法对它们的亲缘关系进行了聚类分析。

METHODS: In 44 eyes of 22 subjects (mean age +/- standard deviation , 24.0 +/- 3.2 years) with orthokeratology, ocular aberrations and mesopic contrast sensitivity were determined before and three months after commencement of the procedure.

对22名受试者（平均年龄±标准差，24.0±3.2岁）的44只眼在接受角膜塑型术治疗前和治疗后3个月时测量眼像差和中间视力对比敏感度。

The big advantage of the Jackknife is that they can be used to evaluate the statistical properties of a statistic that is related to the data in a complicated, nonanalytical way. Apart from estimation of standard deviation, Jackknife can be used to estimate mean, median and even to construct confidence intervals.

大折刀法的最大优点是它能在一个统计量与资料的关系很复杂或无解析的表达式时，可用它估计统计量的统计特性，除了能得到标准偏差外，还可用来估计平均值和中值，甚至构造置信区间。

The calculation formula of the reactive power is concluded by means of the Fourier analysis method. The physical meaning of every item in formulaes is analysed. Finally the article analyses the influence of the reactive power in the nonsinusoidal condition on two primary reactive energy measurement technology. The analysis show that reactive power definition produces which in the standard IEEE100-1996, having a bigger deviation with two kind of reactive energy measurement technology to measure reactive energy.

本文采用傅立叶分析方法，导出非正弦电路的无功功率的计算公式，分析了公式中每一项的物理意义，并就非正弦无功对目前主要的两种无功电能计量技术（电磁感应式无功电能计量技术，电子式无功电能计量技术）的影响进行了理论分析，得出在IEEE 100-1996标准给出的无功功率定义下，用两种无功电能计量技术测量无功均会产生较大偏差的结论。

The physical meaning of every item in formulae is analysed. Finally the article analyses the influence of the reactive power in the nonsinusoidal condition on two primary reactive energy measurement technology. The analysis show that Reactive power definition produces which in the standard IEEE100-1996, Can have a bigger deviation with two kind of reactive energy measurement technology to measure reactive energy.

并就非正弦无功对目前主要的两种无功电能计量技术（电磁感应式无功电能计量技术，电子式无功电能计量技术）的影响进行了理论分析，得出在IEEE100-1996标准给出的无功功率定义下，用两种无功电能计量技术测量无功均会产生较大偏差的结论。

RESULTS: Mean (+/- standard deviation ) times for ophthalmoscopic diagnosis ranged from 4.17 (+/- 1.34) minutes to 6.63 (+/- 2.28) minutes per infant.

结果：眼底镜检查法诊断每个婴儿的平均时间为4.17（±1.34）分钟到6.63（±2.28）。

The results of numerical experiments show that mean terrain height and orographic relative standard deviation over a large scale grid area are two important factors which have influence on the mean flux of surface long wave radiation.

由于地表有效辐射通量是海拔高度的非线性函数，在特定情况下，其影响相当大，可产生不容忽略的误差。

It is shown by analyzing large test data that the empirical formula presented in the paper has higher linearly dependent coefficient, lower average relative error and relative standard deviation compared with the traditional empirical formula of orthoscopic and power function.

试验数据表明，本文提出的经验公式比传统的直线式和幂函数式经验公式的线性相关系数更高，且平均相对误差和相对标准差都低。

The time to peak systolic longitudinal strain and the time to peak systolic radial strain were derived from the LV apical views , and to peak systolic circumferential strain was derived from the parasternal short axis. The standard deviation for time to peak longitudinal、circumferential and radial strain in the 18 segments (LS-SD18、CS-SD18、RS-SD18) and the maximal temporal difference of any two segments(LS-dif、CS-dif、RS-dif)were calculated as a strain-derived dyssynchrony index.

方法16例慢性心衰患者，获取心尖长轴观测量各节段收缩期纵向应变达峰时间，径向应变达峰时间，胸骨旁短轴观测环向应变达峰时间，计算CRT术后1个月、术后3个月18节段纵向、环向、径向应变达峰时间标准差(LS-SD18、CS-SD18、RS-SD18)、左室各节段收缩期纵向、环向、径向应变达峰时间最大差值(LS-dif、CS-dif、RS-dif)作为应变非同步指标。

From the experiment discovered for the first time the dimethyl ether may substitute CO to take the chain-carrying agent of the peroxy free radical chemistry amplifier system, and optimized the CH_3OCH_3-NO-HO_2 chemistry amplifying system determination condition, the CH_3OCH_3 best density is 1.876 ppmv, the NO best density is 1.3ppmv, and obtained this method chain length CL=124, 5 parallel determinations densities of HO_2 are the 44.0pptv, the relatively standard deviation is smaller than 4%; Although chemistry box model computed result indicated the dimethyl ether, the ethene, the propene and the ethanol all can take the chain-carrying agent of the peroxy free radical chemistry amplifier system, and their simulation chain length all grows up compared to the CO-NO-HO_2 chemistry amplifying systems, but experiments proved the ethene, the propene and the ethanol have not suit the chain-carrying agents.

首次从实验上发现二甲醚可以替代CO作为过氧自由基化学放大系统的链传递试剂，并优化了CH_3OCH_3-NO-HO_2化学放大系统的测定条件，CH_3OCH_3的最佳浓度是1876ppmv，NO的最佳浓度为1.3ppmv，并得到了这一方法的链反应长度(CL=124)，5次平行测定浓度为44.0pptv的HO_2自由基，相对标准偏差＜4％；虽然化学盒子模式计算结果表明二甲醚、乙烯、丙烯和乙醇都能作为过氧自由基化学放大系统的链传递试剂，并且它们的模拟链长都比CO-NO-HO_2化学放大体系的链长大，但是实验证明乙烯、丙烯和乙醇不适合作为过氧自由基化学放大系统的链传递试剂。

There had been a moment during the breakfast meeting, though, after the backslapping and the small talk and when all of us were seated, with Vice President Cheney eating his eggs Benedict impassively and Karl Rove at the far end of the table discreetly checking his BlackBerry, that I witnessed a different side of the man.

那次早餐会期间，在表示过关心和寒暄以后，我们所有人坐了下来，我注意观察了一下，副总统切尼面无表情地吃着班尼迪克蛋（Eggs benedict，源自美国，以英式松饼、火腿、水煮蛋以及荷兰酱组合而成），卡尔。罗夫在餐桌的远端谨慎地经常查看他的黑莓手机，我目睹了他所不为人知的一面。

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