多分类有序反应变量Logistic回归及其应用

对近年发展起来的多分类有序反应变量Logistic回归进行了补充和完善 ,设计出对样本数据的应用条件做 χ2 检验的方法 ,证明了比数比在分析自变量作用中的实际意义 .随机抽取 2 0 0 2年国家执业医师资格临床实践技能考试 30岁以下本科毕业考生 5 0 0 0人 ,以考生的考试成绩 (3分类有序变量 )为反应变量 ,以考生的性别、工作单位级别、考试评分方法、考官回避制度、考题重复次数、考试合格率控制措施等 9个影响因素为自变量 ,进行多分类有序反应变量逐步Logistic回归分析 .研究结果已为卫生部改革和完善国家医师资格考试方法、措施提供了重要的科学依据     

岩体分级的多分类有序因变量Logistic回归模型

将多分类有序因变量的Logistic回归分析引入到岩体质量分级问题中,以影响岩体级别的单轴抗压强度、岩体声波纵波速度、体积节理数、节理面粗糙度系数、节理面风化变异系数和透水性系数为自变量,岩体级别为响应变量,以工程实测岩体质量数据作为统计样本,建立了岩体分级公式。对模型进行了拟合优度检验、模型的有效性检验、预测能力的检验,研究结果表明：Logistic逐步回归分析得到的回归模型性能良好,回判估计的误判率为零,预测精度高。相比距离判别分析模型,回归分析模型在现场岩体分级更加方便,回判的误判率更低,另外模型能输出岩体属于各级别的概率,为工程设计人员提供更多的岩体质量信息;相比普通的回归分析,多分类有序因变量 Logistic回归更适于响应变量为有序多类别的岩体分级问题,因而岩体分级的多分类有序因变量回归模型是一种更优的岩体分级方法。     

函数型累积Logistic回归模型研究与应用

该文针对响应变量为有序多分类标量数据，协变量为函数型数据构建函数型累积Logistic回归模型，并在贝叶斯分析框架下构造Gibbs抽样算法解决参数估计问题.具体解决流程为：首先，通过潜变量连接有序响应变量与函数协变量间的关系，同时对回归系数函数和回归函数型自变量选取主成分基函数进行展开，设置潜变量模型误差项服从Logistic分布.再利用Polya-Gamma变换解决模型似然函数的复杂性，并求得回归系数展开系数的后验分布从而构建Gibbs抽样算法.最后将该方法应用与模拟数据和实际空气质量指数(AQI)的分析，结果显示能较好地对模拟数据和空气质量指数(AQI)污染状况进行分类.     

累积比数Logistic回归模型及其应用

在临床医学中评价某种疾病的不同治疗方案效果,进行影响因素分析,可以优化治疗方案,也为制定医疗保障补偿方案提供科学依据.应用累积比数Logistic回归模型,以1 117例急性心肌梗塞（AMI）患者的治疗效果为因变量,以其影响因素为自变量,进行回归分析,找出对治疗效果影响显著的因素.结果表明应用该模型拟合有序多分类变量数据是有效的.     

基于Logistic回归分析模型的足球彩票预测方法

本文收集了2010年-2011年意大利足球甲级联赛前30场比赛中得分、积分、主客场情况、净胜球数等数据,首先对数据做主成分分析,剔除影响不显著的变量,然后运用多分类Logistic回归方法,建立Logistic回归模型,预测比赛结果.结果显示:对2010年-2011意大利足球甲级联赛结果影响较大的是主客场,多分类Logistic回归模型判断正确率较高.     

赣南医学院七届毕业生临床执业医师资格考试成绩分析

本文对赣南医学院七届毕业生临床执业医师资格考试成绩与全国考生对比,总结了临床医师资格考试存在的问题,并就提高地方医学院校教育质量,促进地方医学院校教育与执业医师资格考试接轨进行了探讨。     

南通市企业员工满意度调查研究

文中首先通过界定员工满意度的定义,探究员工满意度的影响因素。以相关概念和理论为支撑,结合南通市企业和人口分布的特点,构建了信度很高且通过效度检验的调查问卷,实地调查后,采用多分类的有序反应变量logistic模型中累积logit模型,即多项有序回归分析法,并借助SPSS工具分析南通市企业员工满意度的现状及其特点,为企业加强市场竞争力和改善员工工作绩效提供借鉴作用。     

缺失数据假设下的灵活贝叶斯分位数回归分析

考虑缺失数据假设下,响应变量为有序分类变量的灵活贝叶斯分位数回归分析.对有序分类变量添加一潜在变量,并假设潜在变量服从广义偏斜拉普拉斯分布,由此建立起有效的贝叶斯后验推断程序.与传统的贝叶斯分位数回归方法相比,本方法的主要优势在于广义非对称拉普拉斯分布的尾部灵活,具有高度的适应性.最终,以云南省某医院生殖遗传中心的试管婴儿数据为例来说明本方法的有效性和适用性.     

蜂桶寨自然保护区毛冠鹿对冬季生境的选择

从2002年11月到2003年3月，在四川宝兴蜂桶寨自然保护区设点，对该区域毛冠鹿冬季生境选择进行了研究．在单变量分析中，植被类型、坡位、郁闭度、竹子密度、老笋密度、乔木大小、草本覆盖率和空地面积8个变量在生境样方和对照样方间存在显著差异．Logistic回归的分析表明草本覆盖率、乔木大小和植被类型是影响毛冠鹿生境选择的主要变量．食性与气候是影响毛冠鹿冬季生境选择的两大主要生态因子．文中还就Logistic回归分析的结果与主成分分析的结果进行比较，两者结果基本一致．     

基于K-均值聚类的多值有序Logistic回归模型在信用卡信用评级中的应用研究

随着全球经济的发展,申请信用卡的人数激增,对于申请人的信用等级的评估显得尤为重要.从申请信用卡的大数据中选取出相对重要的特征变量,通过K-均值聚类方法对客户数据进行分类,分为多个类别.并建立了多值有序的Logistic回归模型.本文的全部输出结果均是在统计软件SAS 9.3环境下实现的,并且采用了SAS宏程序,实现大数据下银行信用卡申请人信用评级的批量数据处理和分析,同时也可将本文的方法推广到其他类似评级分类的大数据处理中.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

The Analects and the Moment in Peking——The influence of a Confucian education system on the personality formation,the way of thinking and the fate of the main characters

0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation＇s behavior in their social life throughout the long history is beyond list.