Threshold Estimation for Stochastic Processes with Small Noise

Consider a process satisfying a stochastic differential equation with unknown drift parameter, and suppose that discrete observations are given. It is known that a simple least squares estimator (LSE) can be consistent but numerically unstable in the sense of large standard deviations under finite samples when the noise process has jumps. We propose a filter to cut large shocks from data and construct the same LSE from data selected by the filter. The proposed estimator can be asymptotically equivalent to the usual LSE, whose asymptotic distribution strongly depends on the noise process. However, in numerical study, it looked asymptotically normal in an example where filter was chosen suitably, and the noise was a Lévy process. We will try to justify this phenomenon mathematically, under certain restricted assumptions.     

Some alternative bivariate Kumaraswamy models

In this article we discuss various strategies for constructing bivariate Kumaraswamy distributions. As alternatives to the Nadarajah et al. (2011) bivariate model, four different models are introduced utilizing a conditional specification approach, a conditional survival function approach, and an Arnold–Ng bivariate beta distribution construction approach. Distributional properties for such bivariate distributions are investigated. Parameter estimation strategies for the models are discussed, as are the consequences of fitting two of the models to a particular data set involving the proportion of foggy days at two different airports in Colombia.     

以学生学习为导向的小学语文作业设计探讨

教师的作业设计,从一个侧面体现了教师的教育思想、教育观念、教育追求,密切联系着学生的成长。小学语文作业设计应该回归教师设计原点,紧扣语文学科的特点,从学生的学习特点、学习需要出发,注重学生的语感培养和语文实践活动,达到提高学生的语文素养的目的。     

Intention to emigrate in transition countries: the case of Albania

We analyse the profile of potential emigrants from Albania using data from the Central and Eastern Europe Eurobarometer in 1992. Respondents were asked to rate on a four-point scale the likelihood that they would go to live in Western Europe. Our results show that intention to emigrate is correlated positively with males, education and certain occupations, and negatively with age. There is little relation between emigration and income. Those who support the introduction of a free market in Albania are also more likely to emigrate than those who do not. Received: 24 August 1998/Accepted: 17 April 2000     

坚持哲学社会科学与自然科学并举并重推进“重要职责”与"第一要务”全面落实

作为人类历史发展最终决定力量的生产力,本身就是自然力与社会力的有机统一.它所客观固有的这一内在本质,既决定了解放、发展社会生产力,尤其是推动先进生产力,必须实行哲学社会科学技术与自然科学技术的并举、并重,又决定了培育、提高先进主体生产力,必须实行哲学社会科学素质和才能与自然科学素质和才能的并举、并重.只有同时坚持这两个并举、并重,我们党代表中国先进生产力发展要求必须始终履行的“重要职责”和"第一要务”,才能得到全面落实.