查询词典 null function

In this paper, we illustrated some statistical issues of confirming efficacy in clinical trials, including its conditions, the determination of clinical margin, the forms of the null and alternative hypothesis and confidence intervals, the choice of endpoints and some miscellaneous considerations.

本文从统计学角度阐明了以安慰剂作为对照和以阳性药物作为对照的3种临床试验确认疗效的条件、确认疗效的界值制定、确认疗效的假设检验方法、确认疗效的可信区间方法、以及确认疗效的指标选择等方面需要注意的问题。

Paired t- tests were performed to investigate the significance of these differences between the SSG and the CIST, where the null hypothesis in each test was that the mean COVs were equal and the alternative hypothesis was that they were not equal.

成对t 检查则调查的意义，这些分歧的特殊保障和中科院，那里虚无假设在每次测试的是平均covs都是平等和替代假设是，他们不是平等的。

Relationship between null and alternative hypothesis; Level of significance; typical steps of hypothesis test, two type errors, critical values.

教学目的：通过学习领会统计假设测验即统计推断的原理及其基本步骤，统计假设测验的两类错误及其关系。

Hypothesis testing entails using data to compare the null hypothesis with a second hypothesis, i.e., the alternative hypothesis.

假设检验利用数据将零假设和另一个假设进行比较。

Grillo C%D′Ambrosio C%Scaloni A Cooperative activity of Ref-1/APE and ERp57 in reductive activation of transcription factors Free Radical Biology and Medicine , 2006,null

JIANG Zhen-dong%姜振东%张学渊%魏运军%袁伟%卓贤露 APE/Ref1在H2O2诱导耳蜗螺旋神经节细胞氧化损伤过程中的表达第三军医大学学报， 2007，5

American Public Health Association Standard Methods for the Examination of Water and Waste Water(15th Edition) New York:APHA , 1980,null

中国国家技术监督局%国家环保局 GB/T 12990-1991。水质-微型生物群落监测-PFU法北京：中国标准出版社， 1992，null

We calculate the field distribution near focus of an aplanatic system for incident ASPBs with different polarization orders and initial azimuthal angles, and based on the simulation results, we find some unique focusing properties of the beams, such as ever on-axis energy null, strong longitudinal field, and flowerlike intensity distribution at focus.

计算了不同偏振级次和偏振初始角的轴对称偏振光束当入射到无球差系统时在焦点附近的场分布，通过这些模拟结果，发现了该光束一些独特的聚焦特性，例如光轴强度始终为零、具有较强的轴向光场以及在焦点附近场呈现花瓣状分布等。

If it is NULL, the dialog object's parent window is set to the main application window.

如果这个参数为空，对话框对象的父窗口被设置到应用程序主窗口。

Null mutant Δmtp1 showed reduction in conidiation, delayed in germination and appressorium formation, and its hyphae showed blacker than wild type strain.

突变子Δmtp1在各种培养基上的生长速度与野生型没有差异，两者附着胞膨压也没有区别。

Generally, The gauge reading demarcated in the laboratory is increasing arithmetic progression,so we can use null method that we intercalate sequential numbers in order to calculate simply. The sum of these sequential numbers are zero. We must intercalate different sequential numbers while the number of trials is odd or even.

因为在试验室标定时，压力表读数一般是按照等差数列递增的，所以为了计算的简便，可用"零点法"设置等差序号，使这一列数据的总和为零，此时要注意当试验次数分别为偶数和奇数时不同地设置等差序号的方法。

If I didn't care what anyone thought, I would.....

如果我不介意别人怎么看，我会。。。。

In recent decades, Chile has mandated earthquake-proofing for new structures, requiring that materials like rubber and features like counterweights be built into the architectural designs to allow buildings to bend and sway during temblors rather than break.

在最近数十年里，智利已经为兴建防震的新土建结构而对建筑材料提出要求，需要的材料类似于橡胶，而特性就象运用在建筑设计中的平衡物体，一旦应用以后，当地震发生时建筑就能弯曲摇摆。