Re-Defining the Who,When, and Where of Mentoring for Professional Statisticians

Organizations tailor their mentoring strategies to accommodate internal resources and preferences, producing different approaches in academic, government, and corporate environments. Across these settings, three common barriers impede effective mentoring of statisticians: overspecialization, time constraints, and geographic dispersion. The authors share mentoring strategies that have emerged at their organization, Mathematica Policy Research, to overcome these obstacles. Practices include creating a methodology working group to unite researchers with diverse backgrounds, integrating mentoring into existing workflows, and harnessing modern technological infrastructure to facilitate virtual mentoring. Although these strategies emerged within a specific professional context, they suggest opportunities for statisticians to expand the channels through which mentorship can occur.     

Nonparametric Bayesian inference for multivariate density functions using Feller priors

Multivariate density estimation plays an important role in investigating the mechanism of high-dimensional data. This article describes a nonparametric Bayesian approach to the estimation of multivariate densities. A general procedure is proposed for constructing Feller priors for multivariate densities and their theoretical properties as nonparametric priors are established. A blocked Gibbs sampling algorithm is devised to sample from the posterior of the multivariate density. A simulation study is conducted to evaluate the performance of the procedure.     

论群体传播时代的莅临

一个"人人都能发声,传播无处不在"的群体传播时代已经到来。产能过剩是群体传播时代的基本经济特征,也是其兴起的社会土壤。互联网为群体传播提供了无时不在的"物理空间"。群体传播在一定程度上消解了大众传播的意义传递和媒介垄断,又为个体、群体、企业和机构参与传播竞争,提供了机会和平台。大众传播、组织传播与群体传播,既存博弈又有合作,只有相互借力才能共赢。在网络推广、文化营销中,充分利用群体传播能够实现"四两拨千斤"的效果。值得注意的是,微博等群体传播与人际传播的交织,却是谣言产生影响力的根源。     

论伊德的科学价值观

伊德"非中性"的科学价值观揭示的是科学的本体论意义上的价值维度,而传统的科学价值观是事实与价值分离的"中性论"的价值观。伊德认为,传统的科学的价值观没有深入到本体论、生成论意义层次,是缺乏深度的知识论意义上的价值观。停留于此基础上的价值观,难免导致科学的"乌托邦"或"敌托邦"。     

奥地利学术腐败案处理及其启示

奥地利在反对学术腐败方面走在世界前列,特别是维也纳医科大学,经历了从科研伦理到科研不端再到学术腐败的发展阶段,已经建立起一个预防和治理学术腐败的有效体系.2007年的辛弗腐败案是奥地利反学术腐败史最著名的一个案件.追踪案件发展始末可以看到,一贯注重科研伦理,并适应时代发展,积极调整策略措施应对学术界出现的新问题,是奥地利有效预防与治理学术腐败的奥秘所在.     

研发模式对企业创新的影响——知识基础的调节作用

 在创新日益呈现出复杂性、系统性和不确定性的背景下，企业对合作研发和内部研发两种研发模式的合理选择及组合运用是提升创新效果的重要途径，但目前的相关研究仍存在一定局限性。一方面，合作研发和内部研发两种研发模式对不同类型创新(如突破式创新和渐进式创新)的影响机理和影响效果是否存在差异还未被厘清；另一方面，企业层面特征(如知识基础)对企业研发模式与企业创新关系的调节作用在已有研究中较少涉及。        针对上述研究现状和现实背景，整合知识基础观和创新管理相关理论，采用层级回归分析方法，收集310家制造企业数据，进行实证分析，研究企业合作研发和内部研发对其突破式创新和渐进式创新绩效的作用机理，以及知识深度和知识宽度对企业研发模式与企业创新关系的调节作用。        研究结果表明，相对于内部研发，合作研发对突破式创新绩效的影响更突出；相对于合作研发，内部研发对渐进式创新绩效的作用更为明显。知识深度在合作研发对突破式和渐进式创新绩效的影响中起正向调节作用，并正向调节内部研发与渐进式创新绩效的关系，但负向调节内部研发与突破式创新绩效的关系；知识宽度在内部研发对突破式和渐进式创新绩效的影响中起正向调节作用，并正向调节合作研发与突破式创新绩效的关系，负向调节合作研发与渐进创新绩效的关系。        在理论层面，考虑了不同研发模式对不同创新类型的影响，丰富了研发模式与企业创新领域的研究成果；引入知识基础作为调节变量，也为研发模式与企业创新之间权变因素的研究做出增量贡献；跳出了相关研究中关于合作研发与内部研发究竟是替代性还是互补性关系的争论，为后续研究提供了新思路。在管理实践层面，企业应根据自身的知识基础以及期望提升的创新类型来选择合适的研发策略。     

Modeling the Adenoma and Serrated Pathway to Colorectal CAncer (ASCCA)

Several colorectal cancer (CRC) screening models have been developed describing the progression of adenomas to CRC. Currently, there is increasing evidence that serrated lesions can also develop into CRC. It is not clear whether screening tests have the same test characteristics for serrated lesions as for adenomas, but lower sensitivities have been suggested. Models that ignore this type of colorectal lesions may provide overly optimistic predictions of the screen‐induced reduction in CRC incidence. To address this issue, we have developed the Adenoma and Serrated pathway to Colorectal CAncer (ASCCA) model that includes the adenoma‐carcinoma pathway and the serrated pathway to CRC as well as characteristics of colorectal lesions. The model structure and the calibration procedure are described in detail. Calibration resulted in 19 parameter sets for the adenoma‐carcinoma pathway and 13 for the serrated pathway that match the age‐ and sex‐specific adenoma and serrated lesion prevalence in the COlonoscopy versus COlonography Screening (COCOS) trial, Dutch CRC incidence and mortality rates, and a number of other intermediate outcomes concerning characteristics of colorectal lesions. As an example, we simulated outcomes for a biennial fecal immunochemical test screening program and a hypothetical one‐time colonoscopy screening program. Inclusion of the serrated pathway influenced the predicted effectiveness of screening when serrated lesions are associated with lower screening test sensitivity or when they are not removed. To our knowledge, this is the first model that explicitly includes the serrated pathway and characteristics of colorectal lesions. It is suitable for the evaluation of the (cost)effectiveness of potential screening strategies for CRC.     

Welfare Programme Participation and the Wellbeing of Non-local Rural Migrants in Metropolitan China: A Social Exclusion Perspective

Social Indicators Research - China has seen an unprecedented increase in rural-to-urban migrants in the last three decades, and the extension of welfare programmes to these migrants has been a...