城市公共交通出行者交通信息选择行为研究

先进的交通信息服务系统建设是我国城市交通可持续发展的必由之路。文章基于大连市公共交通出行信息需求专项调查,通过多维度频率分布研究,对不同个人属性、信息服务特征等条件下公共交通出行者的交通信息内容需求进行分析,进一步建立公共交通出行者交通信息选择binary logistic模型,对公共交通出行者交通信息选择行为进行研究。研究显示,公共交通出行者交通信息内容需求因个人属性、信息服务特征等因素存在较大差别,交通信息内容对公共交通出行者交通信息选择行为存在不同程度的影响。最后,文章基于实证研究结果,提出面向城市公共交通出行者的交通信息服务系统规范化建设的相关策略。     

成长型科技创业企业的信用评价研究

创业企业经常受到外部的融资约束,对成长型科技创业企业尤其严重.因此,构建成长型科技创业企业的信用评价指标体系和模型非常必要.文章基于企业的动态财务数据,并将企业的成长与创新能力作为重要的评价指标,应用Logistic回归方法,提出了成长型科技创业企业的信用评价模型和方法,来动态评价企业的信用状况.通过模型比较和检验,证明其评价准确度较高.     

“一带一路”背景下中国区域物流网络模型研究

选取“一带一路”重点涉及的五大区域18个地区为研究对象,利用改进引力模型测量区域物流引力大小及地区引力总量,构建区域物流网络模型。在明确现有模型的特点和“一带一路”对物流网络目标要求的基础上,考虑区域物流发展水平和区域间差异情况,给出优化方案及优化后的物流网络模型,指出中国区域物流网络存在的问题并给出合理化建议,旨为政府决策提供参考。     

Housing of Seniors in the Czech Republic: Challenges for Social Services

The article focuses on the housing market, the behavior and motivations of senior households to move or to stay in place. Knowing if and why seniors decide to move at retirement is a critical factor for the establishment of social service policies in terms of their structure, location, and provision.

This study uses secondary data based on information about Czech households collected by the Czech Statistical Office (CSO). The data are annually collected via sample surveys of the income and living conditions of households (EU-SILC). The sample covers more than eight thousands of households. Analyzed data cover the period 2007–2012 when the abolishment of rent regulation in the Czech Republic took place. It is hypothesized that an impact like this might increase the willingness to move and reveal the factors which underlie the decisions of particular households.

The results indicated that most Czech households that decided to move during the study period were driven by the increased financial burden of housing. Other factors, including the availability of social services and public utilities within the current location, played only minor roles. It seems that Czech senior households act in a very pragmatic and rational manner when deciding whether to stay in place or move, with the majority of households preferring not to move. Social policies should, therefore, concentrate on providing services for the current locations rather than on the construction of new social housing.     

Grandparents providing care for grandchildren and employment status of grandparents in South Korea

This study examines the association between providing care for grandchildren and the economic status of grandparents, focusing on the employment status. This study asks two questions. First, is providing care for grandchildren related to Korean grandparents’ employment status? Second, are the intensities of providing care for grandchildren related to grandparents’ employment status? In examining these research questions, this study focuses on gender and caregiving intensity. The findings suggest that providing care for grandchildren was associated with Korean grandmothers’ employment status. In addition, there are different relationships between providing care for grandchildren and grandparents’ employment status according to the caregiving intensities.     

公司运营危机预警模型的比较研究——以中国上市公司为例

研究当前国内外公司运营危机预警问题的现状,首先要寻找一套适合于我国上市公司的财务状况识别指标体系,然后依据该指标体系采用不同方法建立运营危机预警模型,最后利用样本公司实际指标数据对各个模型的短期及中期预警效果进行比较分析与实证研究。结果表明,分类树模型的三年期预警准确率都在80%以上。     

Regularized proportional odds models

The proportional odds model (POM) is commonly used in regression analysis to predict the outcome for an ordinal response variable. The maximum likelihood estimation (MLE) approach is typically used to obtain the parameter estimates. The likelihood estimates do not exist when the number of parameters, p, is greater than the number of observations n. The MLE also does not exist if there are no overlapping observations in the data. In a situation where the number of parameters is less than the sample size but p is approaching to n, the likelihood estimates may not exist, and if they exist they may have quite large standard errors. An estimation method is proposed to address the last two issues, i.e. complete separation and the case when p approaches n, but not the case when p>n. The proposed method does not use any penalty term but uses pseudo-observations to regularize the observed responses by downgrading their effect so that they become close to the underlying probabilities. The estimates can be computed easily with all commonly used statistical packages supporting the fitting of POMs with weights. Estimates are compared with MLE in a simulation study and an application to the real data.     

Measurement Error Correction by Exploiting Gene–Environment Independence in Family‐Based Case–Control Studies

Abstract. Family‐based case–control designs are commonly used in epidemiological studies for evaluating the role of genetic susceptibility and environmental exposure to risk factors in the etiology of rare diseases. Within this framework, it is often reasonable to assume genetic susceptibility and environmental exposure being conditionally independent of each other within families in the source population. We focus on this setting to explore the situation of measurement error affecting the assessment of the environmental exposure. We correct for measurement error through a likelihood‐based method. We exploit a conditional likelihood approach to relate the probability of disease to the genetic and the environmental risk factors. We show that this approach provides less biased and more efficient results than that based on logistic regression. Regression calibration, instead, provides severely biased estimators of the parameters. The comparison of the correction methods is performed through simulation, under common measurement error structures.     

私家车增长logistic回归分析模型

为汽车销售行业制定营销策略提供借鉴,也为私家车消费者理性决策提供参考,通过分析购置私家车的主要影响因素家庭因素、停车条件、交通环境、养车费用与购车决策之间的相关关系,运用SPSS软件进行模拟运算,建立了私家车购置logistic回归分析模型,应用该模型对私家车增加进行了预测,并对私家车购置决策提供了可参考的方法。     

安史之乱前后的儒学复兴思潮与文体革新

唐代儒学日趋衰落 ,但安史之乱前后 ,又出现儒学复兴思潮 ,这种思潮是推进文体革新的直接动力。儒学复兴的倡导者萧颖士、李华等人都明确地提出了文体复古的观念 ,即为文效法魏晋以前 ,创立一种骈散相间 ,句式灵活 ,适合于阐扬儒道的新文体。