简论价值论的变迁

从经济学中价值论的变迁及其原因分析入手，结合对马克思劳动价值论分析的根本目的的认识，探究了马克思主义经济学与西方经济学对立的根源所在，提出了对待西方经济学以及坚持和发展马克思主义经济学的应有态度。     

中国风险投资需求研究

我国风险投资发展面临的根本性问题,不是风险资本供给的不足,而是风险投资有效需求的严重不足.加快我国风险投资的发展,必须解决风险投资有效需求严重不足的这个根本性问题.只有培育风险投资需求主体,才能刺激风险投资有效需求的增长,才能推动我国风险投资的发展     

Ebony and Ivory? Interracial dating intentions and behaviors of disadvantaged African American women in Kentucky

Using data from 595 predominantly disadvantaged African American women in Kentucky, this study examines perceptions about racial/ethnic partner availability, cultural mistrust, and racism as correlates of interracial dating intentions and behaviors with both white and Hispanic men. Participants reported levels of dating intentions and behaviors were significantly higher with whites than Hispanics. The multivariate models indicate less cultural mistrust and believing it is easier to find a man of that racial/ethnic category were associated with higher interracial dating intentions. Women were more likely to have dated a white man if they believed it was easier to find a white man and had interracial dating intentions; however, interracial dating intentions was the only significant correlate of having dated a Hispanic man. Findings suggest a shrinking social distance between racial groups, broadening the MMPI for African American women; yet, the low levels of interracial relationships are likely driven by preferences of men.     

钙处理条件下钢包底吹氩工艺的模拟与优化

针对国内某钢铁公司钢包钙处理工艺,根据相似原理建立了物理模型,全面研究了喂丝位置、深度及底吹气量对钢液均混时间的影响,确定了钢包钙处理的最佳底吹工艺参数.在本试验条件下,当底吹气量为2001L/min时,最佳喂丝位置为点14,最佳喂丝深度为0.6～0.8H(H为熔池深度).     

中国区域能源贫困综合评价

中国居民部门存在的能源贫困现象可能会成为改善民生的阻碍,对能源贫困的综合测度及评估分析是认清中国当前能源贫困现状的重要环节,也是国家制定缓解能源贫困政策的前提。在理清中国能源贫困概念和国际能源贫困评估方法基础上,构建了四维度中国区域能源贫困评估指标体系,用以评估中国区域能源贫困现状及变化趋势。研究认为:随着中国经济社会发展,2000—2011年间中国整体能源贫困状况呈自然减缓趋势,但能源贫困问题未来持续大幅减缓还需要依赖政府的重视和专项应对政策的出台和实施;中国区域间能源贫困状态及其减缓速度很不一致,在制定全国能源贫困减缓政策时应充分考虑区域差异,抓住导致不同地区能源贫困的主要矛盾;能源贫困在中国的区域分布情况与中国经济发展水平的区域分布情况并不一致,减缓能源贫困政策实施对象选择和区域投入比例的确定,应区别于其他促进经济社会发展、提升基础建设、改善民生的相关政策。     

Interval estimation for exponential progressive Type-II censored step-stress accelerated life-testing

This paper derives the exact confidence intervals for the exponential step-stress accelerated life-testing model as well as the approximate confidence intervals for the k-step exponential step-stress accelerated life-testing model under progressive Type-II censoring. A Monte Carlo simulation study is carried out to examine the performance of these confidence intervals. Finally, an example is given to illustrate the proposed procedures.     

On a Confidence Interval for the Mean of an Asymmetric Distribution

A clarification is given of the main result (1.1) in Communications in Statistics: Theory and Methods 34:753–766. The term {1 + 6a(r ? a)}^1/3 is to be understood as sgn(1 + 6a(r ? a)) | 1 + 6a(r ? a)|^1/3. The result is expressed in a more user-friendly form. An issue is raised regarding the common usage of the expression x ^1/n when n is even.     

Interval estimation for a lower-truncated distribution based on the double Type-II censored sample

ABSTRACT

The interval estimation problem is investigated for the parameters of a general lower truncated distribution under double Type-II censoring scheme. The exact, asymptotic and bootstrap interval estimates are derived for the unknown model parameter and the lower truncated threshold bound. One real-life example and a numerical study are presented to illustrate performance of our methods.     

Maximum likelihood estimation of bivariate survival probabilities and its existence and uniqueness

Nonparametric maximum likelihood estimation of bivariate survival probabilities is developed for interval censored survival data. We restrict our attention to the situation where response times within pairs are not distinguishable, and the univariate survival distribution is the same for any individual within any pair. Campbell's (1981) model is modified to incorporate this restriction. Existence and uniqueness of maximum likelihood estimators are discussed. This methodology is illustrated with a bivariate life table analysis of an angioplasty study where each patient undergoes two procedures.     

The non-optimality of interval restricted and pre-test estimators under squared error loss

We consider the linear regression model with an interval restriction imposed on the coefficients, and examine the sampling performance of a family of Stein interval restricted and pre-test estimators Tor the coefficient vector. The risk, under squared error loss, of these Stein-like estimators are derived, and the inadmissibility of the maximum likelihood interval restricted and pre-test estimators is demonstrated.