On the asymptotic behaviour of location-scale invariant Bickel–Rosenblatt tests

Location-scale invariant Bickel–Rosenblatt goodness-of-fit tests (IBR tests) are considered in this paper to test the hypothesis that f, the common density function of the observed independent d-dimensional random vectors, belongs to a null location-scale family of density functions. The asymptotic behaviour of the test procedures for fixed and non-fixed bandwidths is studied by using an unifying approach. We establish the limiting null distribution of the test statistics, the consistency of the associated tests and we derive its asymptotic power against sequences of local alternatives. These results show the asymptotic superiority, for fixed and local alternatives, of IBR tests with fixed bandwidth over IBR tests with non-fixed bandwidth.     

Confidence intervals on intraclass correlation coefficients in a balanced two-factor random design

A modified large-sample (MLS) approach and a generalized confidence interval (GCI) approach are proposed for constructing confidence intervals for intraclass correlation coefficients. Two particular intraclass correlation coefficients are considered in a reliability study. Both subjects and raters are assumed to be random effects in a balanced two-factor design, which includes subject-by-rater interaction. Computer simulation is used to compare the coverage probabilities of the proposed MLS approach (GiTTCH) and GCI approaches with the Leiva and Graybill [1986. Confidence intervals for variance components in the balanced two-way model with interaction. Comm. Statist. Simulation Comput. 15, 301–322] method. The competing approaches are illustrated with data from a gauge repeatability and reproducibility study. The GiTTCH method maintains at least the stated confidence level for interrater reliability. For intrarater reliability, the coverage is accurate in several circumstances but can be liberal in some circumstances. The GCI approach provides reasonable coverage for lower confidence bounds on interrater reliability, but its corresponding upper bounds are too liberal. Regarding intrarater reliability, the GCI approach is not recommended because the lower bound coverage is liberal. Comparing the overall performance of the three methods across a wide array of scenarios, the proposed modified large-sample approach (GiTTCH) provides the most accurate coverage for both interrater and intrarater reliability.     

Designs for cropping systems research

The present article establishes equivalence between extended group divisible (EGD) designs and designs for crop sequence experiments. This equivalence has encouraged the agricultural experimenters to use EGD designs for their experimentation. Some real life applications of EGD designs have been given. It has also been shown that several existing association schemes are special cases of EGD association scheme. Some methods of construction of EGD designs are also given. A catalogue of EGD designs obtainable through methods of construction along with efficiency factors of various factorial effects is also presented. In some crop sequence experiments that are conducted to develop suitable integrated nutrient supply system of a crop sequence, the treatments do not comprise of a complete factorial structure. The experimenter is interested in estimating the residual and direct effect of the treatments along with their cumulative effects. For such experimental settings block designs with two sets of treatments applied in succession are the appropriate designs. The correspondence established between row–column designs and block designs for two stage experiments by Parsad et al. [2003. Structurally incomplete row–column designs. Comm. Statist. Theory Methods 32(1), 239–261] has been exploited in obtaining designs for such experimental situations. Some open problems related to designing of crop sequence experiments are also given.     

Asymptotic distributions of statistics and parameter estimates for mixed Poisson processes

Mixed Poisson processes have been used as natural models for events occurring in continuous or discrete time. Our main result is the derivation of the joint asymptotic distributions of statistics, including parameter estimators, computed in different time intervals from data generated by mixed Poisson processes. These distributions can be used, for example, to test the hypothesis about the adequacy of the mixed Poisson process against data. We provide some simulation results and test the model on actual market research data.     

“10+1”与中国企业的“走出去”战略

区域一体化的加速进行和中国-东盟自由贸易区的正式启动,必将对中国企业的"走出去"战略产生双重影响。中国企业可根据自身的特点,扬长避短,从区域、产业、投资方式等方面有选择地实施"走出去"战略。     

Does culture matter for the economic performance of countries? An overview of the literature

From the point of view of economic development, the world is far from being homogeneous. Among the possible causes of such uneven evolution, culture is starting to attract the attention of a growing number of scholars. The present paper surveys some of the most important contributions on culture and economics, with a particular focus on the definition and measurement of culture and on the impact of different cultural traits on economic variables. According to this review of the literature, cultures emphasising individual effort while providing equal opportunities for everyone are more likely to encourage sustained economic growth.     

曲马多联合电针对神经病理性疼痛大鼠模型的治疗及对脊髓IL-1β和IL-10的影响

目的通过神经病理性疼痛大鼠模型,研究曲马多联合电针对神经病理性疼痛的治疗效果,以及对脊髓IL-1β和IL-10水平的影响。方法本研究采用坐骨神经分支选择性损伤的神经病理性疼痛模型,在术后第4天开始,连续7天进行曲马多,电针和针药联合治疗。观察治疗后大鼠机械性痛阈和冷诱发持续性疼痛的变化以及对脊髓IL-1β和IL-10水平的影响。结果①连续治疗7天后,与单独使用曲马多和电针相比,针药联合治疗能有效降低冷板抬足次数和提高50%缩爪阈值,达到更强的镇痛效果;②电针不影响脊髓中IL-1β的水平;③电针可以增加脊髓中IL-10的含量,并且与曲马多具有协同作用。结论曲马多联合电针对神经病理性疼痛治疗,比单独使用曲马多和电针都具有更强的镇痛作用。电针可以增加脊髓中IL-10的水平,并与曲马多具有协同作用。     

A Jackknife Method for Estimation of Variance Components

This paper concerns a method of estimation of variance components in a random effect linear model. It is mainly a resampling method and relies on the Jackknife principle. The derived estimators are presented as least squares estimators in an appropriate linear model, and one of them appears as a MINQUE (Minimum Norm Quadratic Unbiased Estimation) estimator. Our resampling method is illustrated by an example given by C. R. Rao [7] and some optimal properties of our estimator are derived for this example. In the last part, this method is used to derive an estimation of variance components in a random effect linear model when one of the components is assumed to be known.     

FAMILY TIES AND POLITICAL PARTICIPATION

We establish an inverse relationship between family ties and political participation, such that the more individuals rely on the family as a provider of services, insurance, and transfer of resources, the lower is one's civic engagement and political participation. We also show that strong family ties appear to be a substitute for generalized trust, rather than a complement to it. These three constructs—civic engagement, political participation, and trust—are part of what is known as social capital; therefore, in this paper, we contribute to the investigation of the origin and evolution of social capital. We establish these results using within‐country evidence and looking at the behavior of immigrants from various countries in 32 different destination places.