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31.
本文介绍了品种稳定性分析适应性参数法的特点和统计方法,编制了相应的BASIC程序,同时结合了Fainly回归分析法,计算方便,提供信息量大,并增加了绘图功能,供农业科研和生产应用。 相似文献
32.
国家统一与民族多元是现代多民族国家政治整合的基本问题.对美国和加拿大的多元文化主义处理国家统一与民族多元二者关系的实践考察及其局限性和不足的分析,对中国民族区域自治制度的坚持和完善,实现多民族国家中国的政治整合,无疑具有重要的启示. 相似文献
33.
梁启超是中国近代文化转型过程中最具代表性的人物。20世纪初期,梁启超引进西方文化观念,首倡近代多种文体的革新,提出了著名的"群治社会构想",反映在文学思想上主要包括四个方面,即聚合现代民族精神,展示历史进化趋势,"言文一致"语体风格和构建市民文化空间。梁启超"群治"文学观的提出及其有益实践对启蒙国人思想、推进中国文学发展和社会进步,都具有重要意义。 相似文献
34.
The gist of the quickest change-point detection problem is to detect the presence of a change in the statistical behavior of a series of sequentially made observations, and do so in an optimal detection-speed-versus-“false-positive”-risk manner. When optimality is understood either in the generalized Bayesian sense or as defined in Shiryaev's multi-cyclic setup, the so-called Shiryaev–Roberts (SR) detection procedure is known to be the “best one can do”, provided, however, that the observations’ pre- and post-change distributions are both fully specified. We consider a more realistic setup, viz. one where the post-change distribution is assumed known only up to a parameter, so that the latter may be misspecified. The question of interest is the sensitivity (or robustness) of the otherwise “best” SR procedure with respect to a possible misspecification of the post-change distribution parameter. To answer this question, we provide a case study where, in a specific Gaussian scenario, we allow the SR procedure to be “out of tune” in the way of the post-change distribution parameter, and numerically assess the effect of the “mistuning” on Shiryaev's (multi-cyclic) Stationary Average Detection Delay delivered by the SR procedure. The comprehensive quantitative robustness characterization of the SR procedure obtained in the study can be used to develop the respective theory as well as to provide a rational for practical design of the SR procedure. The overall qualitative conclusion of the study is an expected one: the SR procedure is less (more) robust for less (more) contrast changes and for lower (higher) levels of the false alarm risk. 相似文献
35.
Sarah Hamersma Yilin Hou Yusun Kim Douglas Wolf 《Population research and policy review》2018,37(5):729-749
Birth outcomes influence many aspects of later life health and wellbeing, making healthcare access during pregnancy a policy priority. Low-income mothers often depend on Medicaid, for which eligibility is determined by their income relative to state eligibility thresholds. The prevalence of adverse birth outcomes is known to exhibit cyclical variation, due in part to changes in the composition of women giving birth in response to changing economic conditions. However, cyclical variation in adverse birth outcomes also varies with respect to Medicaid eligibility thresholds. Our analysis uses birth-records data for 2000 through 2013, aggregated into 173,936 county-by-quarter observations and linked to county-level unemployment rates and state-level parental Medicaid thresholds. Using fixed-effects negative binomial models, we examine the role of Medicaid generosity in influencing birth outcomes across business cycles. We test for interactions between Medicaid and unemployment, hypothesizing that the negative effects of recessions are worse where Medicaid thresholds are more restrictive. We find that higher Medicaid generosity dampens the negative effects of recessions on birth outcomes. The extent to which Medicaid interacts with unemployment also varies according to the age and race composition of mothers; in particular, Black mothers are both most affected by unemployment and most responsive to Medicaid generosity. Given current concerns about racial gaps in both infant and maternal mortality, our findings suggest that Medicaid may be an important feature of a strategy to close gaps in the prevalence of adverse birth outcomes across racial groups, especially during bust years. 相似文献
36.
1977~2009年人口学CSSCI期刊论文作者统计分析 总被引:3,自引:0,他引:3
论文是科研人员从事科学研究产生成果的重要表现形式,作者数量和文献数量之间的关系是遵循科学研究发展的客观规律。通过使用文献计量学的方法,对7种人口学CSSCI期刊自创刊起至2009年的全部论文进行分析,主要发现:(1)7种期刊不同论文数量的作者占作者总人数的概率分布都遵循Lotka定律,新老作者结构合理;(2)7种期刊新增量都显著低于理论最佳值,说明学术研究队伍非常稳定,但是活力不足,容易出现作者老化现象。 相似文献
37.
This article examines the trends in the economic advantage that highly educated immigrants hold over less educated immigrants in Canada, focusing on the differences between short‐run and longer‐run outcomes. Using data from the Longitudinal Immigration Database covering the period from the 1980s to the 2000s, this study finds that the relative entry earnings advantage that higher education provides to new immigrants has decreased dramatically over the last 30 years. However, university‐educated immigrants had a much steeper earnings trajectory than immigrants with trades or a high school education. The earnings advantage among highly educated immigrants increases significantly with time spent in Canada. This pattern is observed for virtually all immigrant classes and arrival cohorts. The results suggest that short‐run economic outcomes of immigrants are not good predictors of longer‐run results, at least by educational attainment. The implications of these findings for immigration selection policy are discussed in the conclusion. 相似文献
38.
本文将公司治理环境、治理行为及治理绩效间关系这一研究问题寓于作为复杂经济系统的中国电信产业演进和改革过程之中,通过事件分析和时间序列分析方法的结合运用,在搜集中国电信产业1949年-2009年、中国移动通信集团公司1997年-2007年发展数据以及对其进行案例研究的基础上,得出以下结论:中国公司治理环境和治理行为的发展过程遵循间断均衡演进规律;中国公司治理行为呈现对治理环境的整体跟踪与滞后效应,并积极应对环境变化,对环境产生影响;治理环境与治理绩效具有密切关系,公司治理结构和机制的完善以及战略能力的提升是治理缋效提升的前置因素. 相似文献
39.
编制了建设项目团队成员心理契约、工作满意、工作努力、目标绩效的调查问卷,对9家国有企业建设项目的300多名团队成员进行实地调查,共收集278份有效问卷,构建了建设项目团队成员心理契约对目标绩效的影响关系并以工作满意、工作努力作为中介变量的结构模型,采用验证性因素分析法和结构方程模型方法进行分析,研究结果表明:建设项目团队成员心理契约由交易型、关系型和管理型心理契约构成;工作满意对建设项目团队成员心理契约满足程度与建设项目关系绩效的关系具有完全中介作用;工作努力对建设项目团队成员关系型、管理型心理契约满足程度与建设项目任务绩效的关系具有完全中介作用。最后,基于结论给出构建建设项目团队成员激励及目标实现机制的管理启示。 相似文献
40.
文化环境对中小企业发展的影响 总被引:1,自引:0,他引:1
文化环境对中小企业的生存和发展具有重要的影响,它能够促进生产环节的专业化分工,增加产品的文化价值,从而形成企业的文化竞争力。中小企业应采取有效对策,主动、迅速地适应文化环境的变化,充分利用和把握文化环境为自己提供的发展机遇。 相似文献