医学论文中logistic回归分析的误用及案例分析     

韩宏志  官鑫  李欣欣  姜瑾秋  王丽 《编辑学报》2018,30(6):586-588

logistic回归分析在医学研究领域应用较为广泛,但因其涉及的因素较多,统计方法较为复杂,部分研究者未咨询流行病学和卫生统计学专业人员而盲目套用统计学方法,造成其在应用logistic回归分析处理数据时出现诸如自变量选取和纳入、统计模型选择、结果表述和报告时误用错用情况的发生。本文选取公开发表的医学论文,举例分析文章中logistic回归误用错用的情况,指出其正确应用方法,为医学期刊编辑处理类似稿件提供参考。  相似文献   

Key somatic variables associated with,and differences between the 4 swimming strokes     

Alan M. Nevill  Yassine Negra  Tony D. Myers  Senda Sammoud  Helmi Chaabene 《Journal of sports sciences》2020,38(7):787-794

ABSTRACT

This study identified key somatic and demographic characteristics that benefit all swimmers and, at the same time, identified further characteristics that benefit only specific swimming strokes. Three hundred sixty-three competitive-level swimmers (male [n = 202]; female [n = 161]) participated in the study. We adopted a multiplicative, allometric regression model to identify the key characteristics associated with 100 m swimming speeds (controlling for age). The model was refined using backward elimination. Characteristics that benefited some but not all strokes were identified by introducing stroke-by-predictor variable interactions. The regression analysis revealed 7 “common” characteristics that benefited all swimmers suggesting that all swimmers benefit from having less body fat, broad shoulders and hips, a greater arm span (but shorter lower arms) and greater forearm girths with smaller relaxed arm girths. The 4 stroke-specific characteristics reveal that backstroke swimmers benefit from longer backs, a finding that can be likened to boats with longer hulls also travel faster through the water. Other stroke-by-predictor variable interactions (taken together) identified that butterfly swimmers are characterized by greater muscularity in the lower legs. These results highlight the importance of considering somatic and demographic characteristics of young swimmers for talent identification purposes (i.e., to ensure that swimmers realize their most appropriate strokes).  相似文献   

An NCME Instructional Module on Data Mining Methods for Classification and Regression     

Sandip Sinharay 《Educational Measurement》2016,35(3):38-54

Data mining methods for classification and regression are becoming increasingly popular in various scientific fields. However, these methods have not been explored much in educational measurement. This module first provides a review, which should be accessible to a wide audience in education measurement, of some of these methods. The module then demonstrates using three real‐data examples that these methods may lead to an improvement over traditionally used methods such as linear and logistic regression in educational measurement.  相似文献   

Gender-preferential intergenerational patterns in primary educational attainment: An econometric approach to a case in rural Mindanao,the Philippines     

《International Journal of Educational Development》2016

This study investigates the factors determining children's educational attainment, focusing on gender-differential intergenerational patterns, by employing a case study from rural Mindanao. The result mainly shows, unlike general trends in developing countries, educational attainment is more favorable for girls; maternal education level is equally associated with daughters’ and sons’ education levels, and paternal education level is preferentially favorable to their sons. To reduce the disparity, suggestions include providing boy-specific interventions to enhance the magnitude of the father–son educational virtuous circle and comparing the magnitude of gender-equal maternal and boy-preferential paternal education influences to specify which effect is larger.  相似文献   

基于多元线性回归分析的新疆外贸出口对策研究     

程云洁  董程慧 《连云港职业技术学院学报》2019,(2):18-24

目前,新疆外贸正处于新旧动能转换的关键时期,培育外贸发展新动力是进入新时代外贸的必然要求,新动力的形成主要需要供给方进行动力重塑和协调发力,在出口方面通过创新驱动、结构调整、制度变革培育供给侧新动力。研究结合供给侧改革对新疆外贸出口依存度进行分析,运用Eviews对与出口相关的因素进行多元线性回归分析,得出结论:一是要素禀赋与出口呈负相关关系;二是新疆GDP对出口有显著的促进作用;三是人民币汇率变动与出口额之间表现为强相关关系;四是外商直接投资与出口较强的相关关系。最后针对多元线性回归的结果,提出相应的外贸出口增长对策。  相似文献   

中国四省市与新加坡学生科学素养表现之比较——基于PISA2015数据的分析     

赵德成  黄亮 《北京师范大学学报(社会科学版)》2018,(2):23-31

PISA2015科学素养测试结果于2016年底正式公布后,受到社会各界的广泛关注。研究者从OECD在线公布的数据库中选取中国四省市与新加坡的有关数据,对两个经济体15岁在校生的科学素养表现进行比较分析,并通过多水平分析探讨影响学生科学素养的关键因素。结果发现:中国四省市学生在科学素养测试总量表及各分量表上的成绩均非常显著地低于新加坡学生,分差在32.82~43.29之间,效应量达到中等强度;中国四省市学生在工具性动机上得分非常显著地高于新加坡学生,但在科学乐趣与科学自我效能得分上非常显著地低于新加坡学生;在影响因素方面,家庭经济、社会和文化地位、科学乐趣、科学课纪律氛围、教师中科学教师的比例等因素对两个经济体的学生成绩具有显著正向预测效应,但考试焦虑、工具性动机、教师探究式教学等因素表现出显著的负向预测效应。中国四省市要有意识地借鉴新加坡教育经验,改革与完善科学教育,具体建议有:(1)进一步推动课程与教学改革,重视探究式教学与学生批判性思维的培养;(2)加强学校人力资源管理,提高教师专业水平;(3)关注学生非认知表现,激发学生科学学习的内部动机。  相似文献   

城市“异乡人”的现代性认同与传统回归     

吴妍妍 《太原理工大学高等教育研究》2006,24(1):80-84

生于20世纪50年代的“农裔”作家是以“异乡人”姿态面对城市的，他们一度因认同启蒙现代性而挣扎进城，并渴望被城市现代性同化；但在逐渐感受现代性之后，又猛然惊醒于归属传统文化的自我身份正在丧失，寻求传统的归乡行为由此开始。  相似文献   

Relative age and birthplace effect in Japanese professional sports: a quantitative evaluation using a Bayesian hierarchical Poisson model     

Hideaki Ishigami 《Journal of sports sciences》2016,34(2):143-154

Relative age effect (RAE) in sports has been well documented. Recent studies investigate the effect of birthplace in addition to the RAE. The first objective of this study was to show the magnitude of the RAE in two major professional sports in Japan, baseball and soccer. Second, we examined the birthplace effect and compared its magnitude with that of the RAE. The effect sizes were estimated using a Bayesian hierarchical Poisson model with the number of players as dependent variable. The RAEs were 9.0% and 7.7% per month for soccer and baseball, respectively. These estimates imply that children born in the first month of a school year have about three times greater chance of becoming a professional player than those born in the last month of the year. Over half of the difference in likelihoods of becoming a professional player between birthplaces was accounted for by weather conditions, with the likelihood decreasing by 1% per snow day. An effect of population size was not detected in the data. By investigating different samples, we demonstrated that using quarterly data leads to underestimation and that the age range of sampled athletes should be set carefully.  相似文献   

Explaining match outcome in elite Australian Rules football using team performance indicators     

Sam Robertson  Nicole Back  Jonathan D. Bartlett 《Journal of sports sciences》2016,34(7):637-644

The relationships between team performance indicators and match outcome have been examined in many team sports, however are limited in Australian Rules football. Using data from the 2013 and 2014 Australian Football League (AFL) regular seasons, this study assessed the ability of commonly reported discrete team performance indicators presented in their relative form (standardised against their opposition for a given match) to explain match outcome (Win/Loss). Logistic regression and decision tree (chi-squared automatic interaction detection (CHAID)) analyses both revealed relative differences between opposing teams for “kicks” and “goal conversion” as the most influential in explaining match outcome, with two models achieving 88.3% and 89.8% classification accuracies, respectively. Models incorporating a smaller performance indicator set displayed a slightly reduced ability to explain match outcome (81.0% and 81.5% for logistic regression and CHAID, respectively). However, both were fit to 2014 data with reduced error in comparison to the full models. Despite performance similarities across the two analysis approaches, the CHAID model revealed multiple winning performance indicator profiles, thereby increasing its comparative feasibility for use in the field. Coaches and analysts may find these results useful in informing strategy and game plan development in Australian Rules football, with the development of team-specific models recommended in future.  相似文献   

非平衡多阶段物流系统建模与优化方法     

徐杭  徐榕  叶庆泰 《东南大学学报》2005,21(2):220-224

首先提出了参数化界面分布的新概念,将一个非平衡多阶段物流系统转化为多个相互独立的单一阶段物流系统,然后采用Prüfer数对每个阶段上的物流模式进行编码.通过一种改进的解码方法,任何一个随机产生的Prüfer数都能够被解码为一个与物流系统的节点容量相匹配的可行的物流模式.基于这2点创新,建立了一种新的基于参数化界面分布和Prüfer数编码的系统建模方法,相应的遗传算法称为PIP-GA方法.与st-GA方法相比,PIP-GA不但具有更好的优化结果,而且需要的计算时间更少;虽然所需的存储空间有所增加,PIP-GA仍然是一种有效而稳健的非平衡多阶段物流系统建模与优化方法.  相似文献