水库移民对移民机构的满意度及其影响因素分析——基于江西省1361份移民样本的实地调查数据

依据江西省1 361户水库移民样本调查数据,运用多元有序Logistic模型,实证分析了水库移民对移民机构的满意度及其影响因素。结果表明,水库移民对移民机构的评价较高,在基本满意以上的达94.5%;扶持项目安排情况对水库移民评价移民机构产生了显著的负向影响;直补资金发放、扶持项目征求移民意见情况、项目扶持工作评价、项目管理情况、对申诉政策与渠道的了解情况等因素对水库移民评价移民机构产生了显著的正向影响。     

中西部农村居民健康状况Logistic模型分析

运用有序Logistic模型分析了我国中西部农村居民的健康状况及其决定因素。研究发现,近年来我国中西部农村居民健康状况总体有所好转。中部地区的状况要好于西部地区。中老年人的健康水平下降,妇女的健康水平较差。中学教育对改善健康水平有积极影响。收入的增加和家庭环境卫生的改善有助于提高健康水平。建议政府继续加大对中西部地区农村合作医疗制度改革的支持力度,重视对农村基础教育和环境卫生设施的投入,采取措施维护中老年人和妇女群体的健康水平,改善落后地区的卫生设施和医疗保健条件,促进健康公平。     

消费者对转基因食品健康风险与生态风险认知实证研究

采用武汉市消费者抽样调查所获取的横截面数据,分析了消费者对GMF健康风险和生态环境风险的认知现状,并利用有序分类的Logistic回归模型研究了影响风险认知的主要因素。结果表明:大多数消费者对于GMF在人类健康和生态环境的风险认知上持中立态度,而消费者的受教育程度、是否涉及生物科技职业、对GMF了解程度、信息来源渠道、对GMF优缺点认识、对GMF食品标签关注度以及对GMF信任度等因素都对健康与生态风险认知产生显著影响。     

The generalized log-gamma mixture model with covariates: local influence and residual analysis

In a sample of censored survival times, the presence of an immune proportion of individuals who are not subject to death, failure or relapse, may be indicated by a relatively high number of individuals with large censored survival times. In this paper the generalized log-gamma model is modified for the possibility that long-term survivors may be present in the data. The model attempts to separately estimate the effects of covariates on the surviving fraction, that is, the proportion of the population for which the event never occurs. The logistic function is used for the regression model of the surviving fraction. Inference for the model parameters is considered via maximum likelihood. Some influence methods, such as the local influence and total local influence of an individual are derived, analyzed and discussed. Finally, a data set from the medical area is analyzed under the log-gamma generalized mixture model. A residual analysis is performed in order to select an appropriate model. The authors would like to thank the editor and referees for their helpful comments. This work was supported by CNPq, Brazil.     

牧地承包经营权转让意愿影响因素研究——基于农户劳动力配置视角

基于西部3省731户农(牧)户的实地调研数据,从农(牧)户劳动力配置视角分析了牧地承包经营权转让意愿的影响因素。研究结果表明:务牧人口数、近三年务牧消耗、务牧技能水平等对牧地承包经营权转出意愿有显著的负向影响;务工兼牧业人口数、务工技能水平和户均单位土地劳动投入对牧地承包经营权转出意愿有显著的正向影响;务工人口数、户主受教育程度等对牧地承包经营权转让意愿的影响不显著。     

Prevalence of and risk factors associated with cesarean section in Lebanon — A retrospective study based on a sample of 29,270 women

Background

During the last decades, there has been an alarming and dramatic increase in the number of cesarean births in both developed and undeveloped countries. This increase has not been clinically justified but, nevertheless, has raised an important number of issues.

Decomposing primary and secondary effects: A new decomposition method

One strand of educational inequality research aims at decomposing the effect of social class origin on educational choices into primary and secondary effects. We formalize this distinction and present a new and simple method that allows empirical assessment of the relative magnitudes of primary and secondary effects. Contrary to other decomposition methods, this new method is unbiased, is more intuitive, and decomposes effects of both discrete and continuous measures of social origin. The method also provides analytically derived statistical tests and is easily calculated with standard statistical software. We give examples using the Danish Longitudinal Survey of Youth.     

Sums of weighted spacings and a test for the logistic distribution

A simple proof for a theorem of Csörgö and Révész (1981b and 1984) concerning sums of weighted spacings is given, The conditions of the theorem are relaxed. As an application, a goodness-of-fit test for the logistic distribution is proposed. The percentage points of the proposed test statistic are obtained by a simulation experiment.     

Decentralized WIP-oriented manufacturing control (DEWIP)

DEWIP is a manufacturing control system for job shop environments aiming at achieving short and reliable lead times by establishing WIP control loops between the manufacturing work centres. The paper describes the mode of function, the setting of parameters and simulation results of the new manufacturing control system. The setting of parameters is done with the aid of the funnel model and the theory of logistic operating curves, both developed at the Institute of Production Systems at the University of Hanover. The simulation is conducted using industrial data and makes it possible to assess DEWIP with regard to lead times, WIP level, performance and schedule reliability. DEWIP is compared both with an uncontrolled process and with the manufacturing control systems Load oriented order release (LOOR), Conwip and Polca. The results suggest that DEWIP and the models employed for the setting of parameters are suitable for job shop production and therefore offer a valuable alternative to prevailing centralized manufacturing control systems.     

The Folded Logistic Distribution

ABSTRACT

Physical measurements like dimensions, including time, and angles in scientific experiments are frequently recorded without their algebraic sign. The directions of those physical quantities measured with respect to a frame of reference in most practical applications are considered to be unimportant and are ignored. As a consequence, the underlying distribution of measurements is replaced by a distribution of absolute measurements. When the underlying distribution is logistic, the resulting distribution is called the “folded logistic distribution”. Here, the properties of the folded logistic distribution will be presented and the techniques for estimating parameters will be given. The advantages of using this folded logistic distribution over the folded normal distribution will be discussed and some examples will be cited.