为了获得有实用价值的灵敏度及特异度，在筛查阴性者中抽取一定比例样本进行诊断试验是必要的。
In order to obtain the sensitivity and the specificity, which are useful for practice, it is necessary that a subsample should be selected in the screened negative subjects for diagnoses.
科学家们从乌鸦那里收集了样本，以估计它们食物中幼虫的比例。
Scientists have collected samples from crows in order to estimate the proportion of larvae in their diet.
查看一下统计样本数量，参考班级中已经就业的毕业生比例，以及他们的工作类型。
Check the sample size, look at the percentage of the class with jobs, and look at what jobs they're getting.
在退休研究中心的养老金计划的样本中，大约60%在2006年的基金比例达到了80%以上。
In the CRR's sample of pension plans, about 60% had funding ratios of at least 80% in 2006.
这个检验样本的缺点是：人数不成比例，其中男人占了63%。
One drawback of the sample: a disproportionate number, 63%, were men.
我们非常震惊，当我们发现氯元素的比例不仅仅是不相似，而且不像地球上那样每个样本在本质上是一样的，在这里我们一直都在得到巨大的差异。
We very absolutely shocked when we found that not only it's not similar, but unlike the Earth where every sample is essentially the same, here we're getting these enormous differences.
IgM +结果的比例随临床表现、样本采集时间和接种情况的不同而变化。
The proportion of IgM + results varied with clinical presentation, the timing of specimen collection and vaccination status.
研究人员说：“28%看上去是一个很低的比例，但引起注意的是RNA随着时间推移是会降解的，因此新鲜的样本中这个数字会更高、更准确。”
Twenty-eight percent might seem like a low number, the researchers say, but it's significant given that RNA can degrade over time, so fresher samples would likely be more accurate.
中学生和高中生样本中非法服用兴奋剂的比例是百分之四点五。
In a sample of middle- and high school students, the illicit useof stimulant medication was 4.5 percent.
洁净字体(clean font)包含了sansserif(无衬线字体)类字体样本，其比例标准、线条清晰且背景干净。
Clean fonts contain the samples of free fonts of the sans serif family with classic proportions, distinct lines, and clean backgrounds.
作者使用比例训练的BP算法，提出对训练模式进行样本重组的方法，其特点是训练速度快、特征抽取能力强。
A scale training algorithm of BP neural network is used, and sample reorganization method is proposed. Its advantage is the fast training speed and good feature extraction ability.
最后以另一个大的比例减去位于距异类中心较远的对分类不起作用的样本点，以便提取具有代表性的边界向量。
Finally, the other large proportion is decided to reduce those sample points lie on the further from the different class center so that the representative boundary vectors can be extracted.
油气必须以适当的比例进行混合，以得到典型的油藏流体样本。
The gas and oil must be recombined in correct proportion to obtain a representative reservoir-fluid sample.
显然，样本不会导致一个巨大的比例，家庭企业，每市场-家庭公司的比例最高的是在巴西(近35%)，而最低的是在埃及(25%)。
Evidently, the sample does not result in a huge proportion of family firms per market - the highest percentage of family firms is in Brazil (almost 35%) whereas the lowest is in Egypt (25%).
方法问卷法、跨文化比较法及随机抽样调查，按各村18岁至45岁人口比例抽取样本。
Methods Applying answering questionnaires, contrasting cross culture and getting the sample at random. Then we chose each village came from 18 to 45 year-old sample.
样本量分配方法主要有等比例分配、最优分配和内曼分配。
There are three main methods to allocate samples to every stratum: proportionate allocation, optimum allocation and Neyman allocation.
此外，本发明还公开了可发出与样本中存在的病毒量成比例的荧光的探针分子。
Additionally, the invention discloses probe molecules that can fluoresce proportionally to the amount of virus present in a sample.
农业样本上市公司前五大股东持股比例总和CR5所代表的股权集中度与公司绩效呈现倒U型特征；
Equity concentration ratio CR5 which is the sum of shares of the leading five shareholders and corporate performance present an inverse-U shape.
对简单随机不放回抽样，在总体非敏感属性个体比例未知的情况下，给出了两个子样本容量的最优配置。
Under simple random sampling scheme without replacement and unknown proportion of population possessing neutral attribute, the optimal allocation of sizes of two sub-samples is given.
本研究资料得自2005年台中县市的496位依县市接近等比例、乡镇市区及学校不重复原则的15个接近等比例、丛集随机班级样本。
The survey data were collected from a random sample of 496 ninth grade students in 15 probability proportionate multistage cluster classes in Taichung City and County, Taiwan in 2005.
由于识别率较高，造成了正确样本数与错误样本数的比例接近到了8：1。
As the recognition rate is relatively high, the ratio of correct and wrong the number of samples has reached 8:1.
CMML样本中的单核细胞所占比例从4%到35%不等。
此外，该算法采用近似集合中的高斯距离比例来表现样本权重，从而可以在多种数据分布上得到更精确的聚类结果。
Furthermore, the self-adaptive weights arc obtained from the Gaussian distance ration in cluster approximation, which can lead to the more accurate clustering results.
选用我国上市公司的大样本数据，实证检验公司高层中女性比例的高低对上市公司的盈余质量的影响。
Using a large sample of Chinese listed companies, whether the gender ratio difference in senior management affect firms 'earnings quality is examined.
检验的样本崩溃点是样本中能逆转判决的离群值的最小比例 。
The sample breakdown point of a test for moment estimation of population variance;
结果：样本机构的药品采购价格上升、不变和下降的比例各占1/3；
Results: 1/3 of the essential medicines' procurement prices are higher than that before the policy, 1/3 unchangeable and 1/3 lower.
结果：样本机构的药品采购价格上升、不变和下降的比例各占1/3；
Results: 1/3 of the essential medicines' procurement prices are higher than that before the policy, 1/3 unchangeable and 1/3 lower.
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