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怎样合理利用辅助变量 被引量:1
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作者 刘军 郑少智 《统计与决策》 CSSCI 北大核心 2004年第6期135-136,共2页
关键词 辅助变量 抽样调查 调查变量 系统抽样 不等概率抽样 比率估计量 回归估计量 最佳效果原则
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抽样调查中负相关比率估计探讨
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作者 章国刚 黄晓华 《浙江统计》 2001年第10期14-15,共2页
本文主要探讨的是负相关性比率估计———即在调查变量与辅助变量为负相关的条件下 ,对总体参数进行比率估计的方法。它按照正相关比率估计(以下简称比率估计)的基本原理 ,对调查变量及与呈高度负相关的辅助变量进行坐标变换 ,使之满足... 本文主要探讨的是负相关性比率估计———即在调查变量与辅助变量为负相关的条件下 ,对总体参数进行比率估计的方法。它按照正相关比率估计(以下简称比率估计)的基本原理 ,对调查变量及与呈高度负相关的辅助变量进行坐标变换 ,使之满足比率估计成立的前提条件 ,然后再对总体参数进行比率估计。 展开更多
关键词 抽样调查 比率估计 负相关比率估计 调查变量 辅助变量
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应重视回归推断估计方法在抽样实践中的应用
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作者 吴明礼 《审计与经济研究》 1997年第4期58-60,64,共4页
应重视回归推断估计方法在抽样实践中的应用吴明礼对于抽样问题的研究,应该包括两个内容:一个内容是关于“怎样抽样”(即抽样的组织方式和方法),一个内容是关于“怎样推断”(即对未知总体参数的估计)。而在目前绝大多数的有关抽... 应重视回归推断估计方法在抽样实践中的应用吴明礼对于抽样问题的研究,应该包括两个内容:一个内容是关于“怎样抽样”(即抽样的组织方式和方法),一个内容是关于“怎样推断”(即对未知总体参数的估计)。而在目前绝大多数的有关抽样文章中,仅局限于抽样方式的设计、... 展开更多
关键词 推断估计 辅助变量 调查变量 样本均值 总体参数 等距抽样 区间估计 点估计 抽样推断 职工人数
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基于数学模型的中国亚健康特征评价方法与危险因素分析 被引量:5
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作者 周雅芳 何剪太 +4 位作者 张阳德 刘蔚东 孙维佳 曾强 谭家驹 《中国组织工程研究与临床康复》 CAS CSCD 北大核心 2010年第30期5609-5613,共5页
背景:目前中国尚缺乏南北多地区共同采集亚健康样本的相关研究,且对亚健康的判别亦缺乏明确标准。目的:通过多地区多中心采集大样本建立亚健康判断数学模型,明确亚健康参考诊断标准,确定国内亚健康人群的重要临床特征,探讨亚健康发生的... 背景:目前中国尚缺乏南北多地区共同采集亚健康样本的相关研究,且对亚健康的判别亦缺乏明确标准。目的:通过多地区多中心采集大样本建立亚健康判断数学模型,明确亚健康参考诊断标准,确定国内亚健康人群的重要临床特征,探讨亚健康发生的危险因素。方法:参照国际上比较公认的健康测量量表,建立亚健康状态人群特征研究的量化问卷调查表。以中南大学湘雅医院、解放军总医院、佛山市第一人民医院的3个健康体检中心为基地,采集位于国内政治中心、经济发达地区和内地等不同层次的总样本数为2097例的亚健康人群资料,严格质量控制数据录入。用统计学方法选取变量,用logistic回归及分类树方法建模,从而得到亚健康的判别方程极其主要特征。结果与讨论:国人处于亚健康的人群比例占所调查人数的57.8%,亚健康普遍存在。建立的logistic回归模型是一个较好的亚健康评判方法。亚健康的主要临床表现为手脚打颤或发冷发热、气短、发热、心慌、排便困难、睡着出汗,消化不良、食欲下降、精力下降等。亚健康高发人群的高危因素是家庭摩擦、睡眠不实、缺乏体育锻炼、缺少个人信仰。 展开更多
关键词 亚健康 问卷调查:自变量 LOGISTIC回归模型 分类树模型 数字化医学
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交叉分层抽样下的总体推估方法探讨
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作者 卢宗辉 《统计与预测》 CSSCI 1997年第4期25-27,共3页
交叉分层抽样下的总体推估方法探讨卢宗辉在分层抽样中,我国通常只讨论总体按一个标志简单分层的情况,而对总体按两个或两个以上标志交叉分层的情况则讨论甚少,甚至可以说是一片空白。鉴于此,本文拟跟踪国外最新发展,对交叉分层抽... 交叉分层抽样下的总体推估方法探讨卢宗辉在分层抽样中,我国通常只讨论总体按一个标志简单分层的情况,而对总体按两个或两个以上标志交叉分层的情况则讨论甚少,甚至可以说是一片空白。鉴于此,本文拟跟踪国外最新发展,对交叉分层抽样下的总体推估方法进行探讨。一、问... 展开更多
关键词 交叉分层 比率估计法 组合估计 分层比率估计 辅助变量 无偏估计 推估 分层抽样 估计方法 调查变量
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Patient and physician perception of natural orifice transluminal endoscopic appendectomy 被引量:2
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作者 Tomas Hucl Adela Saglova +4 位作者 Marek Benes Matej Kocik Martin Oliverius Zdenek Valenta Julius Spicak 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第15期1800-1805,共6页
AIM:To investigate perception of natural orifice transluminal endoscopic surgery(NOTES)as a potential technique for appendectomy.METHODS:One hundred patients undergoing endoscopy and 100 physicians were given a questi... AIM:To investigate perception of natural orifice transluminal endoscopic surgery(NOTES)as a potential technique for appendectomy.METHODS:One hundred patients undergoing endoscopy and 100 physicians were given a questionnaire describing in detail the techniques of NOTES and laparoscopic appendectomy.They were asked about the reasons for their preference,choice of orifice,and extent of complication risk they were willing to accept.RESULTS:Fifty patients(50%)and only 21 physicians(21%)preferred NOTES(P<0.001).Patients had previously heard of NOTES less frequently(7%vs73%,P<0.001)and had undergone endoscopy more frequently(88%vs 36%,P<0.001)than physicians.Absence of hernia was the most common reason for NOTES preference in physicians(80%vs 44%,P= 0.003),whereas reduced pain was the most common reason in patients(66%vs 52%).Physicians were more likely to refuse NOTES as a novel and unsure technique(P<0.001)and having an increased risk of infection(P<0.001).The preferred access site in both groups was colon followed by stomach,with vagina being rarely preferred.In multivariable modeling,those with high-school education[odds ratio(OR):2.68,95% confidence interval(CI):1.23-5.83]and prior colonoscopy(OR:2.10,95%CI:1.05-4.19)were more likely to prefer NOTES over laparoscopic appendectomy.There was a steep decline in NOTES preference with increased rate of procedural complications.Male patients were more likely to consent to their wives vaginal NOTES appendectomy than male physicians(P=0.02).CONCLUSION:The preference of NOTES for appendectomy was greater in patients than physicians and was related to reduced pain and absence of hernia rather than lack of scarring. 展开更多
关键词 Natural orifice transluminal endoscopic surgery Patient perception Physician perception APPENDECTOMY LAPAROSCOPY
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Measurement of public awareness of climate change in China:based on a national survey with 4,025 samples 被引量:1
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作者 Binbin Wang Yating Shen Yangyang Jin 《Chinese Journal of Population,Resources and Environment》 2017年第4期285-291,共7页
Just before the new round of UN climate change conference in Bonn, a survey report, named as the Climate Change in the Chinese Mind 2017, was released in Beijing. The investigation was conducted in the form of a compu... Just before the new round of UN climate change conference in Bonn, a survey report, named as the Climate Change in the Chinese Mind 2017, was released in Beijing. The investigation was conducted in the form of a computer-assisted telephone survey with a sample size of 4,025 samples, covering 332 prefecture-level administrative units and four municipalities in China.Urban-rural proportion and sex proportion were specially taken into account, so as to demonstrate the Chinese public awareness objectively. The investigation measures the public awareness from six aspects, which includes climate change beliefs, impacts, response, policies, actions, and the assessment of the effectiveness of climate communication. This article presents the key findings of the survey and provides further insights behind the data. 展开更多
关键词 Climate change publicawareness publicparticipation nationalsurvey the Paris agreement
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Analysis of Leader Intelligence in Telecommunication Industry in Indonesia
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作者 Ratri Wahyuningtyas 《Journal of Modern Accounting and Auditing》 2014年第1期125-132,共8页
Intelligence is individual capacity to act appropriate with purpose, think rationally, and adjust with environmental conditions. A successful company is related with the intelligence and ability of its leader to creat... Intelligence is individual capacity to act appropriate with purpose, think rationally, and adjust with environmental conditions. A successful company is related with the intelligence and ability of its leader to create excellent strategies to be a winner in a competition. High competition occurs among cellular operators in Indonesia. The big-five companies in telecommunication industry are PT. Telkomsel Tbk., PT. XL Axiata Tbk., PT. Indosat Tbk., PT. Telkom Tbk., and PT. Bakrie Telecom Tbk.. Intelligence development is a main focus for an individual to be an effective leader in every situation. The purpose of this research is to find out more about leader intelligence in telecommunication industry. This research uses survey and descriptive method. Operational variables consist of intellectual intelligence (X0, emotional intelligence (X2), spiritual intelligence (X3), and adversity intelligence (X4). We use the Likert type as a scale of quetionaire. We use convenience sampling as a sampling technique. Results from data processing show that intellectual intelligence, emotional intelligence, spiritual intelligence, and adversity intelligence of leader in telecommunication industry are included in high category with an average percentage of 77.95%. There is no dominant intelligence that is needed to be a successful leader. The main focus is how leaders can synergize all the intelligence that they have to solve a problem, and they must also realize that changes in the telecommunication industry are very fast, so they must familiarize themselves to uncertain situations. 展开更多
关键词 intellectual intelligence emotional intelligence spiritual intelligence adversity intelligence
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Two-Stage Double Sampling by Variables and Its Simulation
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作者 李元生 李士昌 李鹏 《Journal of China University of Mining and Technology》 2002年第2期228-230,共3页
The method to use double sampling on the two stage sampling was introduced and its characteristics were obtained through amalyzing and simusating.
关键词 two stage sampling double sampling SIMULATION
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Effects of Soil Management on Changes of Soil Carbon Content in Alluvial Paddy Soil
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作者 Toshimitsu Honma Hirotomo Ohba Takuj i Ohyama 《Journal of Environmental Science and Engineering(A)》 2012年第2期219-223,共5页
Effects of soil management on carbon content in alluvial paddy were investigated using past soil survey data of Niigata prefecture, Japan. The changes of soil management were as follows: (1) slight decrease in nitr... Effects of soil management on carbon content in alluvial paddy were investigated using past soil survey data of Niigata prefecture, Japan. The changes of soil management were as follows: (1) slight decrease in nitrogen and phosphate fertilizer application rates; (2) decrease to half in the application of soil amendments, like calcium silicate; (3) decrease in compost application and increase in rice straw application; (4) increase in pipe drainage. In spite of these changes, negligible change of carbon content in the plow-layer of alluvial paddy soils had been observed for past 25 years. However, without rice straw application and paddy-upland rotations, the soil carbon content had been decreased. Carbon content of alluvial paddy soils classified into Gley Lowland soil (Fluvisol or Gleysol) at the depth of 0-30 cm was calculated about 49-103 g-kg"1 and gross carbon sequestration was calculated 7.68 Mt in the paddy field soils in Niigata prefecture. 展开更多
关键词 Carbon sequestration soil survey alluvial paddy soil management.
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