Estimation in zero-inflated binomial regression with missing covariates

We investigate inverse-probability-weighted (IPW) maximum likelihood estimation in zero-inflated binomial regression with missing-at-random covariates. Large sample properties (consistency, asymptotic normality) of the IPW estimator are established. Finite sample properties are assessed via simulations. The methodology is illustrated on a real data set.     

基于心理契约ERA循环的物业管理处主任岗位技能标准体系设计

本研究旨在提高管理处主任队伍绩效考核的针对性和合理性,规范物业管理处主任基本技能及要求,对国内物业管理行业岗位技能标准体系设计有一定的意义。采用文献综述法、访谈法和问卷调查法等方法进行研究。以心理契约ERA循环管理理论为指导,确立了职业操守和工作技能两个指标体系,并分别对每一指标体系内容及评价标准进行了界定。     

A new bivariate beta distribution

A new bivariate beta distribution capable of providing better fits than all its competitors is introduced. Various representations are derived for its product moments, marginal densities, marginal moments, conditional densities and conditional moments. The method of maximum likelihood is used to derive the associated estimation procedure. Applications to six bivariate data sets are illustrated.     

Bivariate regression models based on compound Poisson distribution

Based on a compound Poisson distribution, new bivariate regression models are introduced and studied. The parameters of the bivariate regression models are estimated by using the maximum likelihood method. Two applications on real datasets are presented to illustrate the models. The results show that these models are compatible to other bivariate Poisson models.     

Underdispersion models: Models that are “under the radar”

The Poisson distribution is a benchmark for modeling count data. Its equidispersion constraint, however, does not accurately represent real data. Most real datasets express overdispersion; hence attention in the statistics community focuses on associated issues. More examples are surfacing, however, that display underdispersion, warranting the need to highlight this phenomenon and bring more attention to those models that can better describe such data structures. This work addresses various sources of data underdispersion and surveys several distributions that can model underdispersed data, comparing their performance on applied datasets.     

A simulation comparison on spatial Poisson mixed models

The statistical methods for analyzing spatial count data have often been based on random fields so that a latent variable can be used to specify the spatial dependence. In this article, we introduce two frequentist approaches for estimating the parameters of model-based spatial count variables. The comparison has been carried out by a simulation study. The performance is also evaluated using a real dataset and also by the simulation study. The simulation results show that the maximum likelihood estimator appears to be with the better sampling properties.     

拓展技工学校班主任谈心艺术

谈心对于师生之间沟通思想、交换意见、交流信息、解决矛盾、融洽感情、增强信赖有着非常重要的作用。有效的谈心,就象一把金钥匙,一下子就能打开学生心头的锁,能使学生如临春风、如沐春雨。在有准备的谈心下要适当运用谈心技巧.达到预期效果后应及时注意总结,有助于班主任下一阶段的工作进展,同时更是班主任提升自我管理艺术的宝贵财富。     

腰麻-硬膜外联合麻醉在高龄患者人工股骨头置换术中的应用

目的探讨腰麻-硬膜外联合麻醉(CSEA)用于高龄患者人工股骨头置换手术的可行性。方法将30例72岁以上患者随机分为腰麻-硬膜外联合麻醉组(CSEA组,n=16)和硬膜外组(EA组,n=14),记录麻醉起效时间,镇痛效果,阻滞平面及注药前、注药时、注药后15min、30min及术毕几个时间点的收缩压(SDB)、舒张压(DBP)、心率(HR)的变化。结果CSEA组麻醉过程比EA组平稳,麻醉起效时间明显缩短,镇痛完善,肌松好,血流动力学影响小。结论CSEA用于高龄患者人工股骨头置换手术,只要应用得当,可达到安全可靠、满意的麻醉效果。     

"单位量词+of+名词"结构小议

本文主要根据Halliday在系统功能语法中有关"单位量词+of+名词"这类名词词组的语法结构及逻辑结构的分析,研究了英语中诸如a strong cup of tea, a boiling pot of water, a thick cloud of smoke 之类的表达方式,探讨了这类结构的句法特征,运用规律及语用成因.     

《伐檀》主旨新探

<诗经·伐檀>一诗主旨,并非"刺贪"或"反对阶级剥削".通过对诗的作者、车的用途、<诗经>时代魏地情形的考证,以及诗末句的训释可推知:诗人以车正(车人之首)的身份,叙写伐檀造车之事,并拟用对答之语,借以肯定自己为"不素餐"者,理应受禄.