A new unrelated question randomized response model

In this paper, we extend the work of Gjestvang and Singh [A new randomized response model, J. R. Statist. Soc. Ser. B (Methodological) 68 (2006), pp. 523–530] to propose a new unrelated question randomized response model that can be used for any sampling scheme. The interesting thing is that the estimator based on one sample is free from the use of known proportion of an unrelated character, unlike Horvitz et al. [The unrelated question randomized response model, Social Statistics Section, Proceedings of the American Statistical Association, 1967, pp. 65–72], Greenberg et al. [The unrelated question randomized response model: Theoretical framework, J. Amer. Statist. Assoc. 64 (1969), pp. 520–539] and Mangat et al. [An improved unrelated question randomized response strategy, Calcutta Statist. Assoc. Bull. 42 (1992), pp. 167–168] models. The relative efficiency of the proposed model with respect to the existing competitors has been studied.     

When is n large enough? Looking for the right sample size to estimate proportions

The central limit theorem indicates that when the sample size goes to infinite, the sampling distribution of means tends to follow a normal distribution; it is the basis for the most usual confidence interval and sample size formulas. This study analyzes what sample size is large enough to assume that the distribution of the estimator of a proportion follows a Normal distribution. Also, we propose the use of a correction factor in sample size formulas to ensure a confidence level even when the central limit theorem does not apply for these distributions.     

Estimation of Stigmatized Characteristics of a Hidden Gang in a Finite Population

This paper considers the problem of estimating the size and mean value of a stigmatized quantitative character of a hidden gang in a finite population. The proposed method may be applied to solve domestic problems in a particular country or across countries: for example, a government may be interested in estimating the average income of victims or perpetrators of domestic violence. The proposed method is based on the technique introduced by Warner (1965) to estimate the proportion of a sensitive attribute in a finite population without threatening the privacy of the respondents. Expressions for the bias and variance of the proposed estimators are given, to a first order of approximation. Circumstances in which the method can be applied are studied and illustrated using a numerical example.     

基于PID与模糊控制的切削加工过程双模控制

为了克服在切削加工过程中单一的控制策略建立的控制系统性能不理想的情况,采用了多个系统并联的切削加 工过程模型。结合了PID控制和模糊控制两者各自的优点,设计实现了对切削加工过程的双模控制。利用MATLAB对 该控制策略进行响应仿真并调试参数,求解出了较优的基于PID控制与模糊控制的切削加工过程双模控制的控制器,有 效地提升了对切削加工系统的控制性能。     

《内蒙古工业大学学报》(自然科学版)五年载文分析(1994～1998)

本文对《内蒙古工业大学学报》（自然科学版）１９９４～１９９８ 年五年载文情况进行了统计分析．其中包括收稿及刊用率,稿源,分类,内容,篇幅,出版时滞,作者情况以及各类基金论文发表情况等．将其统计结果与文献〔１〕进行了比较,结果表明刊用率,出版时滞和文章篇幅均较上一个五年有所下降．     

两部门经济周期波动模型——对卡尔多周期模型的古典解释

在古典假设及卡尔多经济周期模型的基础上,本文构建了一个包含家庭与企业的两部门经济周期波动模型。首先,将工资收入用于消费,资本性收入用于储蓄这一古典假设与卡尔多非线性函数思想相结合对模型中的消费、储蓄、投资三个函数进行重新界定;其次,卡尔多模型中储蓄投资曲线的关系在本模型中表现为企业每一期的利润决定了经济脱离一般均衡后的运行状态,一旦经济脱离一般均衡状态,企业利润的变动将引起投资的变化,投资在长期中向资本存量的转化使得工资总额与资本存量及总收入的结构比例关系随之改变,收入流量与资本存量的结构失衡最终导致经济形成周期波动之势。     

Coverage‐adjusted Confidence Intervals for a Binomial Proportion

We consider the classic problem of interval estimation of a proportion p based on binomial sampling. The ‘exact’ Clopper–Pearson confidence interval for p is known to be unnecessarily conservative. We propose coverage adjustments of the Clopper–Pearson interval that incorporate prior or posterior beliefs into the interval. Using heatmap‐type plots for comparing confidence intervals, we show that the coverage‐adjusted intervals have satisfying coverage and shorter expected lengths than competing intervals found in the literature.     

基于PLC的线筒包装生产线控制系统设计

目前,缝纫线线筒外标签的包装大部分是由工人手工操作完成的,成本高昂,效率低。为解决这些问题,通过分析线筒包装的工艺过程,设计了一种全新的缝纫线线筒自动化包装机构,并采用PLC控制,实现了包装的自动化。实际应用表明,该系统具有较高的生产效率。     

新经济地理学视角下的产业集聚影响因素研究——以浙江省制造业为例

在梳理新经济地理学文献的基础上,基于2001至2010年浙江省27个制造业部门数据,选取产业关联、地方专业化水平、企业规模、外资比例等因素,并通过 eviews6.0对浙江省制造业产业集聚影响因素进行了考量,分析发现本地市场效应、外资比例、企业规模等新经济地理学中的因素很大程度上促进了产业集聚.     

终极控制人、金字塔控制与控股股东的"掏空"行为研究

以我国上市公司2004～2007年相关数据为基础,从终极控制人的股权属性、金字塔控制结构、控制权和现金流权的分离3个维度对上市公司纵向股权结构与控股股东的“掏空”行为进行了实证研究。结果发现：中央政府控制的上市公司被控股股东“掏空”的总程度最小,地方政府和自然人控制的上市公司被控股股东“掏空”的总程度没有显著差异;政府控制的控股股东更多地通过生产性经营来“掏空”上市公司,自然人控制的股东则更多地通过非经营性方式来“掏空”上市公司;自然人对上市公司的金字塔控制层级越多,控制权和现金流权的分离程度越大,控股股东对上市公司的“掏空”行为越严重;在中央政府控制的上市公司中,金字塔控制层级越少,控制股东的“掏空”行为越严重,控制权和现金流权有分离的上市公司被控股股东占用的资金高于控制权和现金流权没有分离的公司。