Principal point classification: Applications to differentiating drug and placebo responses in longitudinal studies

Principal points are cluster means for theoretical distributions. A discriminant methodology based on principal points is introduced. The principal point classification method is useful in clinical trials where the goal is to distinguish and differentiate between different treatment effects. Particularly, in psychiatric studies where placebo response rates can be very high, the principal point classification is illustrated to distinguish specific drug responders from non-specific placebo responders.     

Suspicious minds: local context and attitude variation across Swedish municipalities

Johansson Sevä I. Suspicious minds: local context and attitude variation across Swedish municipalities
Int J Soc Welfare 2010: 19: 225–235 © 2009 The Author(s), Journal compilation © 2009 Blackwell Publishing Ltd and the International Journal of Social Welfare. This article investigates whether degree of suspicion of welfare abuse relates to local context in Sweden. It is suggested that certain features of Swedish municipalities can create a local information bias influencing individual suspicion of welfare abuse. Prevalence of social problems and political climate are features of the municipal context having the potential to influence opinion formation. Social problems are captured by local unemployment, social assistance and ill‐health rates. Political climate is captured by electoral support for conservatives. The results indicate that local context can influence suspicion of welfare abuse, contexts where social problems are widespread reduce such suspicion. While local political climate seems important in itself, it also interacts with social problem level, increasing suspicion if a conservative political climate and social problems coexist. While social problems seem to generate less suspicion regarding social policy abuse, they also provide ‘raw material’ for political rhetoric regarding suspicion.     

基于DEA模型的电信企业投资效果评估研究

首先建立了电信企业投资效果评估的DEA模型指标体系,然后分别从DEA有效性、技术有效性和规模有效性3个方面对某省13个地市的电信企业投资效果评估进行了实证分析,并根据分析结果提出了相应的对策。     

Is regression adjustment supported by the Neyman model for causal inference?

This paper examines both theoretically and empirically whether the common practice of using OLS multivariate regression models to estimate average treatment effects (ATEs) under experimental designs is justified by the Neyman model for causal inference. Using data from eight large U.S. social policy experiments, the paper finds that estimated standard errors and significance levels for ATE estimators are similar under the OLS and Neyman models when baseline covariates are included in the models, even though theory suggests that this may not have been the case. This occurs primarily because treatment effects do not appear to vary substantially across study subjects.     

川牧α—复合添加剂预混料饲养效果试验报告

选用长白×荣昌F_1代断奶仔猪24头,随机分成2组,在接近农村饲养条件的中等营养水平下,对川牧α—复合添加剂预混料(猪用)进行了对比试验。试验结果表明。该饲料产品在生长猪的饲养中具有促进生长发育、提高日增重的作用和提高饲料利用率、降低饲料消耗之功效。该饲料产品能适应我国养猪生产之需,具有良好的增产作用。     

Rejoinder to 'Ahmed, M.S. (1998). A note on regression-type estimators using multiple auxiliary information.'

In the estimators t ₃ , t ₄ , t ₅ of Mukerjee, Rao & Vijayan (1987), b _{y x} and b _{y z} are partial regression coefficients of y on x and z , respectively, based on the smaller sample. With the above interpretation of b _{y x} and b _{y z} in t ₃ , t ₄ , t ₅ , all the calculations in Mukerjee at al. (1987) are correct. In this connection, we also wish to make it explicit that b _{x z} in t ₅ is an ordinary and not a partial regression coefficient. The 'corrected' MSEs of t ₃ , t ₄ , t ₅ , as given in Ahmed (1998 Section 3) are computed assuming that our b _{y x} and b _{y z} are ordinary and not partial regression coefficients. Indeed, we had no intention of giving estimators using the corresponding ordinary regression coefficients which would lead to estimators inferior to those given by Kiregyera (1984). We accept responsibility for any notational confusion created by us and express regret to readers who have been confused by our notation. Finally, in consideration of the above, it may be noted that Tripathi & Ahmed's (1995) estimator t ₀ , quoted also in Ahmed (1998), is no better than t ₅ of Mukerjee at al. (1987).     

纳米技术的正负效应及社会控制初探

纳米技术是一门崭新的综合性科学技术,将对21世纪经济、社会和国防产生重大影响,很可能成为21世纪的主导技术。纳米技术的发展既能带来正效应,也能带来负效应,目前,社会对纳米技术的负面效应认识不够。只有对纳米技术实施有效的社会控制,才能引导它向健康方向发展。     

运用强化手段进行正面上手发球技术教学的实验研究

对高师体育系排球普修课正面上手发球技术教学进行了实验与研究 .     

新兴市场国家与地区证券市场开放增长效应的条件研究

开放国家或地区开放前国内证券市场规模的大小是决定开放增长效应是否存在的前提.合理的制度安排与良好的宏观经济环境--表现为高人均国民生产总值、高合同执行率、低通货膨胀与低国家信用风险--对证券市场开放的增长效应有显著强化作用.国际间比较显示,我国已基本满足证券市场开放的前提条件要求.但在证券市场开放前,还需要进一步扩大市场规模、强化公司治理以及修订完善相关证券监管法规,以降低开放风险,实现开放增长效应的最大化.     

幽默语言弱关联因素分析

幽默语言在追求幽默交际中最佳关联同时,牺牲的却是语义、语境、逻辑最大关联。但是,在幽默交际中,如果说话者和听者能够互明幽默意图,如果听者能通过语境,利用自身的语言文化知识,能够实现幽默语言的最佳关联。