Bounding the resampling risk for sequential Monte Carlo implementation of hypothesis tests

Sequential designs can be used to save computation time in implementing Monte Carlo hypothesis tests. The motivation is to stop resampling if the early resamples provide enough information on the significance of the p-value of the original Monte Carlo test. In this paper, we consider a sequential design called the B-value design proposed by Lan and Wittes and construct the sequential design bounding the resampling risk, the probability that the accept/reject decision is different from the decision from complete enumeration. For the B-value design whose exact implementation can be done by using the algorithm proposed in Fay, Kim and Hachey, we first compare the expected resample size for different designs with comparable resampling risk. We show that the B-value design has considerable savings in expected resample size compared to a fixed resample or simple curtailed design, and comparable expected resample size to the iterative push out design of Fay and Follmann. The B-value design is more practical than the iterative push out design in that it is tractable even for small values of resampling risk, which was a challenge with the iterative push out design. We also propose an approximate B-value design that can be constructed without using a specially developed software and provides analytic insights on the choice of parameter values in constructing the exact B-value design.     

Bayesian principal component analysis with mixture priors

A central issue in principal component analysis (PCA) is that of choosing the appropriate number of principal components to be retained. Bishop (1999a) suggested a Bayesian approach for PCA for determining the effective dimensionality automatically on the basis of the probabilistic latent variable model. This paper extends this approach by using mixture priors, in that the choice dimensionality and estimation of principal components are done simultaneously via MCMC algorithm. Also, the proposed method provides a probabilistic measure of uncertainty on PCA, yielding posterior probabilities of all possible cases of principal components.     

刑法上的自救行为

韩国刑法典中,作为违法性阻却事由之一明确规定有"自救行为"。韩国刑法中的"自救行为"指依据法定程序不可能保全请求权时,为避免其请求权的实行不能或显著的实行困难而实施的行为,其具有在紧急状况中私人代行国家权力的行为性质。韩国刑法"自救行为"的成立需要具备如下条件:一是自救行为状况;二是自救意思;三是相当理由。一旦成立自救行为,即使发生符合构成要件的结果,也将阻却违法性而不成立犯罪。     

Declining inter-industry wage dispersion in the US

Industrial effects have long been significant factors in wage inequality. Previous research indicates that wage differentials across industries were increasing through the mid 1980s. Using more recent data, however, we find that the level of inter-industry wage dispersion declined by 36% from 1986 to 2002 despite the continued trend towards increasing inequality in the labor force. This decline in inter-industry wage dispersion is evident across gender and educational groups. Using multilevel growth curve models, our multivariate results indicate that the decline is only weakly related to industrial changes in education, occupation or even productivity despite the fact that the latter variable had been a critical factor in the prior period. Indicators of globalization and downsizing also do not appear to explain this decline. For the more recent period, the most important factors associated with the narrowing of inter-industry wage dispersion are reduced unionization rates and the higher proportion of casual workers. We interpret these results as suggesting that firms may now be less economically obliged to pass on a portion of their rents to broad groups of workers and may instead be engaged in more idiosyncratic processes of negotiation with individual workers based on micro-level sources of bargaining power.     

人类的性、爱及性爱的哲学分析

爱和性合为性爱。爱是倾向性好的感情 ,人在青少年期萌生指向性的爱 ,最初为思念。性是异性间合而为一的欲求。爱和性随着生理的成熟一同到来。人对性是用身体来认识 ,对爱是用心来认识 ,二者殊途但终合为一 ,即性爱。性爱可以分为有爱的性交、无爱的性交和无性交的爱三种。爱与性交一方面具有相互的规定性 ,另一方面还有单方面的规定性。性爱是面向完全的、理想者的。性爱的原动力是理念 ,性爱前瞻性地志向于尚未存在的将来。     

略论方以智的太极观--从"一两之辨"看方以智"一在二中"、"舍二则无一"的思维方式

太极观在宋明理学史上占有重要地位。方以智的太极观注重太极范畴的逻辑展开方式 ,以太极为理气统一体 ,从太极和仪象的关系 ,推广到太极和天地万物的关系 ,进而讨论了本体和现象的问题。据此 ,他否认易学中的义理学派的世界观 ,即理作为独立自存的实体 ,脱离象数而存在 ,从而得出离现象别无本体的结论。一方面扬弃了朱熹的理为太极说 ,一方面也发展了张载以来的气为太极说 ,成为宋明哲学中唯物主义本体论的代表之一。     

Immigrant incorporation in the garment industry of Los Angeles

This study expands immigrant social network theory and examined employment patterns in the garment industry in Los Angeles, California, among Latino workers employed by Asian immigrant entrepreneurs. The study determined that a large percentage of immigrant employees found their jobs through the immigrant economy. Entrepreneurship increased the supply of local jobs and expanded the economy at destination at no expense to natives. Immigrant entrepreneurs bought firms from nonimmigrant owners or started new ones with an immigrant labor supply. Massey's index is flawed due to its exclusion of the role of entrepreneurs. Migration networks facilitate entrepreneurship, but some ethnic groups have fewer entrepreneurs, such as Mexicans and Central Americans. A 1993 Los Angeles survey identified 3642 garment factories in its county. Mean employment was 27.1 persons. The garment industry was the 4th largest industry in the area in 1996, with 98,700 employees. It represented 6% of all wage and salary employees in the City and 5.5% of the immigrant labor force in the County in 1990. 93% of garment workers in 1990 were immigrants. It is estimated that 51% of garment factory owners were Asians; most employees were Latinos. Census figures on sewing machine operators indicated 47.3% of owners were Whites and 42.45 were Asians. 53.3% of employees were other ethnic groups, 14.5% were Asians, and 32.2% were Whites. It is estimated that 47.2% of total employment was due to the immigration economy. 71.5% of the total employment in the garment industry was in the immigrant sector.