样本大小
样本大小的相关文献在1981年到2022年内共计130篇,主要集中在预防医学、卫生学、数学、经济计划与管理
等领域,其中期刊论文128篇、专利文献37370篇;相关期刊67种,包括福建质量管理、生态学报、中国卫生统计等;
样本大小的相关文献由222位作者贡献,包括胡良平、鲍晓蕾、关雪等。
样本大小—发文量
专利文献>
论文:37370篇
占比:99.66%
总计:37498篇
样本大小
-研究学者
- 胡良平
- 鲍晓蕾
- 关雪
- 周诗国
- 高歌
- 严擎宇
- 亚斯比尔·辛格·纳亚尔
- 刘灿然
- 布莱恩·金斯伯格
- 曹胜炎
- 职为梅
- 范明
- 詹绍康
- 马克平
- 马毅林
- Adnan Maqsood
- Akiko Ono
- Asim Shaukat
- BAI ZhiDong
- CUI HengJian
- Dong Ho Choi
- FU ChangFeng
- Fernandez A.
- HAN LianFu
- HE Lei
- Hajime Sato
- Hark Kyun Kim
- Hassan Bukhari
- Healv MJR
- Hideyuki Chiba
- JIANG DanDan
- Jian Liu
- Ken Ohata
- Keuchkerian S.E.
- LI RunZe
- LIU YongMeng
- Nobuyuki Matsuhashi
- Sang Jae Park
- Sosa C.G.
- TANG WenYan
- Takafumi Ito
- WANG Jun
- WANG Tao
- Wei-sheng Guan
- Yosuke Tsuji
- Yu-liang Li
- ZHENG ShuRong
- ZHU LiPing
- ZHU LiXing
- 于振凡
-
-
靳荣秀;
田俊;
何鹏飞;
贾越;
郭珏;
王斌全
-
-
摘要:
Three-dimensional (3D) image reconstruction technologies can reveal previously hidden microstructures in human tissue.However,the lack of ideal,non-destructive cross-sectional imaging techniques is still a problem,especially for large size sample such as whole larynx.Therefore,this article review the method and advances in the study of three-dimensional reconstruction of largescale tissue cells by serial slices,This is an offer to help the research of the microstructures of large size sample such as whole larynx.%三维重建技术的发展使我们研究人类组织器官的微观空间结构更加直观,然而由于缺乏理想的连续组织切片技术,特别是全喉这样的大尺度组织,其高分辨率组织空间结构的构建困难重重.本文综述了基于大尺度组织连续切片三维重建的方法及进展,为喉等大组织超精细空间结构研究的开展提供帮助.
-
-
朱奕伟;
朱晓文
-
-
摘要:
基因的分离定律是自由组合定律的基础,是高中生物的核心知识之一,是高考的热点内容.而基因分离定律的异常试题我们较少研究.近几年的高考对本考点的考查试题形式较多.如选择、简答、综合分析等,考查的知识多为对概念的理解、基因型和表现型几率的计算及分离定律异常在实践上的应用等.运用揭示定律的科学方法设计实验,用分离定律解决实践中的相关问题是今后命题的主要趋势.
-
-
杨宁敏;
冀子中;
叶丽萍;
潘杰;
陈光兰;
叶斌;
毛珺梁;
林朗;
张加坤;
王实;
欧阳宏;
孟飞;
朱新建;
吕丽红;
杨军华;
施正超;
林昌平;
徐芳;
王群英;
毛吉波;
厉有名;
徐书华;
姜洋;
黎宏章;
张筱凤;
郭锋;
吴建胜;
李伟平
-
-
摘要:
Objective To combine clinical big data and precision medicine by investigating the antibiotic resistance rates of Helicobacter pylori ( HP) and establishing the mathematical model for antibiotic selection based on the resistance data from 2009 to 2015 in 32 cities and counties in Zhejiang province. Methods The resistance rate of 534,657 HP samples were analyzed from 58 hospitals in Zhejiang province from 2009 to 2015. The best combination of antibiotics by establishing 0⁃1 mathematical model, function cal⁃culation and roulette algorithm was obtained with city or county as a statistical unit. Results There were sig⁃nificant differences in clarithromycin and levofloxacin resistance rates among 32 cities and counties in Zhe⁃ jiang province, with levofloxacin resistance significantly higher than that of clarithromycin. The mathematical model for antibiotic selection was established based on local antibiotic resistance data. Conclusion In the background of antibiotic resistance in China, the antibiotic resistance differences in different counties and populations in Zhejiang province can be a reference for HP eradication. Population⁃based antibiotic resistance detection and its potential of health economics is worth more attention.%目的了解2009年至2015年7年间浙江省32个县市幽门螺杆菌( HP)抗生素耐药分布情况,建立耐药大样本数据引导下的智能给药模型,实现大数据和精准医疗的有机结合。方法以县市为单位,分别统计2009年至2015年间浙江省58家医院534657例临床样本HP对不同抗生素的耐药率。通过建立0⁃1规划模型,并采用遗传算法对模型进行求解,获得不同地区大样本数据指导下的最佳给药抗生素组合。结果浙江省32个县市HP克拉霉素和左氧氟沙星耐药率存在显著性差异,左氧氟沙星耐药率明显高于克拉霉素。依据不同地区抗生素耐药背景,建立了一套地区抗生素耐药背景下的智能给药模型。结论浙江省地域及人群间HP耐药性差异可作为中国抗生素耐药背景下HP根除策略的参考。基于人群HP耐药监测的拓展应用及其潜在的卫生经济学意义应当受到重视。
-
-
-
单爱莲;
倪力强
-
-
摘要:
针对国内新药在多中心临床试验中,采用区组统计病例收集后,出现的中心闻样本不均衡的问题,本文回顾国外或国际指导原则中相应的意见或要求,阐述在估计总体治疗效应时存在的两种权重分析方法的区别及其合理应用.
-
-
曾晟;
徐华清;
张家男;
马青叶
-
-
摘要:
There are some information problems between priori and posteriori sample’s number according to the Bayes inference method for geotechnical parameters. When solving the engineering problems,the acquisition of priori and posteriori distribution is determined by the number of the sample,and the project fee must be paid while getting the sample number. The simplified Bayesian inference method has been put to apply to analyzing the priori and posteriori sample number of geotechnical parameters. According to the analysis of geotechnical parameters,the conclusion has been gotten as following. The calculated er-ror of statistical parameters’ mean and variance is minimum when the number of priori sam-ples and posteriori samples reaches to 30~50 and posteriori sample number is no less than 4 . This dissertation provides references for the determination of geotechnical engineering mechanics parameters of sample number of probability and statistics.%岩土力学参数Bayes统计推断存在验前和后验样本信息问题。在解决工程问题时,先验与后验分布信息的获取是靠样本容量的大小确定,而获取样本信息是要付出工程费用的。为了探讨岩土参数Bayes法推断中先验与后验样本的取值大小,采用贝叶斯推断简化方法,通过对某工程的岩土力学参数分析,得到先验样本数为30~35个和后验样本数不少于4个时,计算出的统计参数均值与方差的误差最小。本文的研究为岩土工程力学参数概率统计样本大小的确定提供了参考。
-
-
-
Dong Ho Choi;
Sang Jae Park;
Hark Kyun Kim
-
-
摘要:
Distinguishing ampullary carcinoma from pancreatic carcinoma is important because of their different prognoses.micro RNAs are differentially expressed according to the tissue of origin.However,there is rare research on the differential diagnosis between the two types of cancers by micro RNA in periampullary cancers.The present study was undertaken to compare micro RNA profiles between ampullary and pancreatic carcinomas using microarrays.mi R-215 was most significantly overexpressed in ampullary carcinomas;whereas the expressions of mi R-134 and mi R-214 were significantly lower in ampullary carcinomas than in pancreatic carcinomas.When these discriminatory micro RNAs were applied to liver metastases,they were correctly predicted for the tissue of origin.Although this study is limited by small sample size,striking difference in micro RNA expression and concordant expression of discriminating micro RNAs in primary tumors and metastases suggest that these novel discriminatory micro RNAs warrant future validation.
-
-
周云华;
高歌;
濮翔科;
傅颖;
施佳琛
-
-
摘要:
目的 为敏感问题复杂抽样调查提供科学的样本大小估计公式.方法 使用哥西不等式、求条件极小值点等方法,从数学上推导出样本大小计算公式.对北京市男男性行为人群进行了预调查,为计算正式调查的样本大小估计出相关统计量的数值.结果 对敏感问题加法模型分层二阶段抽样,推导出在限定抽样误差的值使调查费用达到最小和限定调查费用的值使抽样误差达到最小时所需的样本大小估计公式;在北京市男男性行为人群正式调查中,在限定抽样误差V((μ))的值V =0.0105使调查费用达到最小,第一层(15 ~ 29岁)需抽取的区县数n11=7(个),平均每个区县需抽取的男男性行为者人数为(n)21=115人;第二层(30 ~ 49岁)需抽取的区县数n12=7(个),平均每个区县需抽取的男男性行为者人数为(n)22=107人.结论 本文提供的数量特征敏感问题加法模型分层二阶段抽样调查样本大小估计公式,具有较大的理论意义和实际应用价值.
-
-
张国平;
王茂林;
于斌
-
-
摘要:
在科研和生产过程中,炮口测速装置要在弹道炮和战斗炮上进行初速标定和测速误差检测,两个平台上初速标定系数的一致性问题、测速误差合格判断问题、合理的检测样本大小问题,应用概率论和数理统计理论及方法、语言去解释和处理。从炮口测速装置的工作原理出发,分析了影响测速误差的主要因素,确定了初速标定系数一致性判别准则和测速误差合格判别准则,在给定置信水平条件下,确定合理的检测样本大小,分析方法和思路对火炮其他试验(如初速检测、立靶密集度试验、弹药运输前后弹道一致性试验等)数据处理、指标合格判定具有借鉴作用。%In process of scientific research and production,muzzle velocity measurement device must be calibrated and the measured velocity error must be checked at the ballistic simulation gun and the combat gun.The check consistency of muzzle velocity calibration coefficients in the both guns,acceptability j udgment of measured velocity error and reasonable test sample size must be interpreted and solved by use of the probability theory and mathematical statistical method as well as the language in terms of probability and statistics.From the point view of the principle of muzzle velocity measurement device,the main factors that have influence on the measured velocity error were found out and analyzed.Judge criterion for consistency of calibra-ting coefficients and measured velocity acceptability at different guns were determined.Under the condition of the given confidence level,a reasonable test sample size was acquired.Some a-nalysis methods and resolved problem process may provide the reference for data processing and acceptability j udge of the other tests,such as muzzle velocity test,dispersion test with vertical target,consistency test of ammunition performance before and after transportation etc.