关于Orlicz函数列的一种等价性

本文给出了一种 Orlicz 函数列的等价的定义,讨论了其判别方法和性质,并给出,了 l■=h■的一个充分条件.     

Predicting successful and unsuccessful transitions from school to work by using sequence methods

Policy makers recognize the importance of identifying early young people who are likely to end up jobless on entry to the adult labour market. This paper uses sequence techniques to characterize 712 young peoples' transitions from school to work into `types', with jobless types interpreted as unsuccessful transitions. A logit model is estimated for transition type using a collection of static individual, family and school characteristics. This allows us to identify which young people are most likely to experience unsuccessful transitions into the adult labour market. Policy makers might use such information to target social and educational policy more effectively to promote social inclusion.     

有限样本平稳序列与单位根序列的不可区分性

本文应用依分布收敛相关理论,给出在有限样本下,平稳序列与单位根序列不可精确区分这一结论的新证明;结合蒙特卡洛模拟实验,解释了有限样本下单位根检验出现水平扭曲或功效偏低现象的合理性;本文还在相同的理论框架下证明,根据有限序列所得的参数估计值、相应统计量及样本外一期预测值的依分布收敛性,从而说明针对有限样本的单位根检验尽管不完美,但仍是有意义的。     

A sequential testing procedure for outliers and structural change

In this paper a test for outliers based on externally studentized residuals is shown to be related to a test for predictive failure. The relationships between a test for outliers, a test for a correlated mean shift and a test for an intercept shift are developed. A sequential testing procedure for outliers and structural change is shown to be independent, so that the overall size of the joint test can be determined exactly. It is established that a joint test for outliers and constancy of variances cannot be performed.     

Sequential selectiok procedures based on confidence sequences for normal populations

In this paper confidence sequences are used to construct sequential procedures for selecting the population with the a common variance. These procedures are shown to provide substantial saving, particularly in the expected samplw sizes of the inferior populations,over various procedures in the literature. A new “indifference zone” formulation is given for the correct selection probability requirement, and confidence sequences are also applied to construct sequential procedures for this new selection goal.