变异系数

An algorithm is developed to differentiate sleep stages with respiration frequency and frequency of leg movements to differentiate sleep into four sleep stages including awake, deep sleep, light sleep and REM.

接著本研究即尝试发展一套判读睡眠阶段演算法，以呼吸频率变异系数和腿部动作频率两项外显行为讯号判读睡眠阶段，能将整晚睡眠区分为清醒、深眠、浅眠、 REM 等四个阶段。

Based on this model, Monte-Carlo simulation was made for a kind of single-cylinder diesel engine crankshaft.

根据多种情况下的模拟数据，分析了曲轴强度均值及变异系数对其工作可靠性的影响。

For the leaf area index of the three forest types, there was a similar variation trend, i.e ., increased first and decreased then, with the maximum presented in mid-July or August for Q. mongolica and J.mandshurica forests while in mid-August or September for F. rhynchophulla forest. The canopy porosity of the three forest types also had a similar variation trend, but opposite to leaf area index, being decreased first and increased then, with the minimum presented in mid-June, July, August or September. The analysis of variation coefficients of leaf area index, transmitted direct gap light, and transmitted diffuse gap light indicated that the spatial pattern of leaf area index in July-September was the main factor affecting the spatial distribution of transmitted diffuse gap light.

结果表明，3种林型的叶面积指数变化总体趋势是一致的，均呈先上升再下降的单峰曲线，蒙古栎林和胡桃楸林都是在7月中旬或8月中旬达到最大峰值，花曲柳林是在8月中旬或9月中旬达到最大峰值；3种林型冠层孔隙度的变化总体趋势也是一致的，呈先下降再上升的单峰曲线，不同样地峰值出现的时间也不同，最低峰值在6、7、8、9月中旬均有出现；通过对不同月份的叶面积指数、林下散射光、林下直射光的变异系数分析表明，7—9月叶面积指数的空间格局是影响林下散射光空间分布的主要因素。

The precision of the enzyme assays were improved by using calibrators.

在应用校准品后，多数项目测定结果的变异系数得到不同程度的改善，ALT由10%-44%下降至8%～42%，LD由16%～39%下降至8%～11%。

Which can be used to weighs safety grades of pressure pipes with planar disfigurements under steady load are proposed in this paper .

和K的均值及变异系数的关系，得出了可靠性指标能定量衡量静载下含平面缺陷的压力管道的安全状况的结论。

This paper through indoor physical model experiments, studied the coefficient of permeability variation, a multiple of polymer solution into the pore volume, polymer molecular weight and polymer concentration on the remaining oil after polymer flooding potential and distribution.

本文本文通过开展室内物理模型实验，研究了渗透率变异系数、聚合物溶液注入孔隙体积倍数、聚合物分子量和聚合物溶液浓度对聚合物驱后剩余油潜力及分布的影响。

K-means, and self-organizing map and the feature selection methods based on coefficient of variation and simple T-test were integrated. To evaluate the performance of the Samcluster system, the Samcluster was applied to four expression datasets COLON, LEUKEMIA72. LEUKEMIA38, and OVARIAN. The results show that there are only 5, 1,0, and 0 samples misclassified, respectively. We conclude that the proposed scheme. SamCluster. is an efficient method for automatic discovery of sample classes using gene expression profile.

在Samcluster系统中，整合了下列聚类算法：谱系聚类、K-平均值聚类和自组图聚类与变异系数计算和T-检验等基因变量选择方法，并提出了一致的样本分型概念，通过对四个基因表达谱的数据集COLON、LEUKEMIA72、LEUKEMIA38和OVARIAN的测试，结果表明：误判的样本数分别为5、1、0和0个，因此，基因水平的样本分型与样本的临床分型高度一致。

The method can determine Aldrin, Dieldin and Endrin at the same time, with characters of simple approaches and strong operability Their determination results showed higher accuracy and variation coefficient.

该方法可同时测定艾氏剂、狄氏剂和异狄氏剂，并具有步骤简单，操作性强的特点，其测定结果具有较高的准确度和变异系数。

The standard error was estimated using the range R = xmax ?xmin of the samples x1, x2,…, xn .

通过样本x1，x2，…，xn的极差R = x_-x_估计样本标准差S和变异系数的结果为： 2。

In order to find out the pureness of parental Carassius auratus Tungting and make an analysis of morphological genetic law between parent and progeny, the study sets out to test 27 parents and 32 offspring of Carassius auratus Tungting from Beiming lake.

为查明洞庭青鲫原种亲本种质的纯度，进行亲本、子一代之间形态学性状遗传传递规律的分析，测定了从北民湖引入的洞庭青鲫原种亲本27尾和子一代32尾，对其7项可比性状和可数性状进行统计分析，计算出各性状的均值、标准差、变异系数。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。