Modeling cooperation among self-interested agents: a critique

This paper reviews recent attempts to model cooperation in groups of self-interested unrelated individuals. It concludes that no empirically plausible model has been developed, and the economist's quest for an explanation of human prosociality in terms of self-interested agents has not been successful. We show that the equilibrium criteria employed in standard game-theoretic models have no attractive dynamic properties, and the mechanisms deployed in these models are not generally seen in empirical examples of cooperative groups. We also show that these models are not robust to plausible rates of signaling error and mutation. We present an alternative, involving strongly reciprocal agents, that satisfies all the requirements for a dynamically stable model of cooperation.     

《洛阳伽蓝记》里的单纯词

本文具体分类研究了《洛阳伽蓝记》中各种类型的单纯词,简要概括了单纯词在汉语词汇史上的地位。     

深蕴着人情美的艺术珠玑——《古诗十九首》艺术特色谫论

《古诗十九首》不但把文学从经学中解放出来 ,而且在艺术上具有很高的成就。它善于借景抒情 ,又善于撷取抒情主人公瞬息的感情、生活片断来抒发主人公的内心情感 ,特别是在构思上具有很高的艺术性 ,真可谓钟嵘所说的“一字千金”     

Asymptotic bias in the linear mixed effects model under non-ignorable missing data mechanisms

Summary.  In longitudinal studies, missingness of data is often an unavoidable problem. Estimators from the linear mixed effects model assume that missing data are missing at random. However, estimators are biased when this assumption is not met. In the paper, theoretical results for the asymptotic bias are established under non-ignorable drop-out, drop-in and other missing data patterns. The asymptotic bias is large when the drop-out subjects have only one or no observation, especially for slope-related parameters of the linear mixed effects model. In the drop-in case, intercept-related parameter estimators show substantial asymptotic bias when subjects enter late in the study. Eight other missing data patterns are considered and these produce asymptotic biases of a variety of magnitudes.     

Influence diagnostics and outlier tests for semiparametric mixed models

Summary. Semiparametric mixed models are useful in biometric and econometric applications, especially for longitudinal data. Maximum penalized likelihood estimators (MPLEs) have been shown to work well by Zhang and co-workers for both linear coefficients and nonparametric functions. This paper considers the role of influence diagnostics in the MPLE by extending the case deletion and subject deletion analysis of linear models to accommodate the inclusion of a nonparametric component. We focus on influence measures for the fixed effects and provide formulae that are analogous to those for simpler models and readily computable with the MPLE algorithm. We also establish an equivalence between the case or subject deletion model and a mean shift outlier model from which we derive tests for outliers. The influence diagnostics proposed are illustrated through a longitudinal hormone study on progesterone and a simulated example.     

元稹诗三议

本文是对元稹诗歌创作、文集流布、道德评价等问题的全面论述,既吸收了学术界已有的研究成果,又融入了我们自己的心得体会,希望有助于相关问题的进一步讨论。     

《马端肃公诗集》刊刻、流传及价值初考

《马端肃公诗集》是明代中期著名政治家马文升的诗集，白寿彝先生在其主编的《回族人物志》中认为该诗集已经佚失。其实，《马端肃公诗集》自明代万历十八年（1590）刊刻后就一直在流传，并于20世纪初收藏在南京图书馆。笔者试对《马端肃公诗集》的刊刻、流传情况及价值作一考论。     

新世纪冯至《十四行集》研究的回顾与反思

检视新世纪冯至《十四行集》的研究，从内外结合的版本研究、现代解诗学的实践、审美现代性范式以及比较研究四个方面，回顾近十多年研究成果，辨析和反思研究观念与研究方法，展望《十四行集》研究的可能学术增长点。     

Some new constructions of circular balanced repeated measurements designs

Repeated measurements designs are widely used in medicine, pharmacology, animal sciences, and psychology. In this article, some infinite series are developed to generate the balanced repeated measurements designs for p (periods) even. For p odd, construction procedures are also described. Catalogues of the proposed designs are also presented for p = 5, 7, 9, when v ≤ 100.     

《中国少数民族文艺理论集成》注释误漏举隅

《中国少数民族文艺理论集成》一书的出版填补了我国文艺理论研究史上的不少空白.但由于此书成于众手,错舛之处亦在所难免,按页码顺序从该书中可拣出除刘禹锡部分(刘禹锡部分有另文论之)之外的、有明显误漏的注释十二条,并有翔实的史料可为此举证.