Marginal Means/Rates Models for Multiple Type Recurrent Event Data

Recurrent events are frequently observed in biomedical studies, and often more than one type of event is of interest. Follow-up time may be censored due to loss to follow-up or administrative censoring. We propose a class of semi-parametric marginal means/rates models, with a general relative risk form, for assessing the effect of covariates on the censored event processes of interest. We formulate estimating equations for the model parameters, and examine asymptotic properties of the parameter estimators. Finite sample properties of the regression coefficients are examined through simulations. The proposed methods are applied to a retrospective cohort study of risk factors for preschool asthma.     

经济学和经济哲学的智慧

经济学是关于经济生活的智慧 ,而经济哲学则是对经济学智慧的进一步抽象 ,是更高一层的智慧。经济哲学应当深入经济学研究中探求方法论问题 ,并要求有更多、更广的“原创性”。     

Perfect simulation for correlated Poisson random variables conditioned to be positive

In this paper we present a perfect simulation method for obtaining perfect samples from collections of correlated Poisson random variables conditioned to be positive. We show how to use this method to produce a perfect sample from a Boolean model conditioned to cover a set of points: in W.S. Kendall and E. Thönnes (Pattern Recognition 32(9): 1569–1586, 1999), this special case was treated in a more complicated way. The method is applied to several simple examples where exact calculations can be made, so as to check correctness of the program using ²-tests, and some small-scale experiments are carried out to explore the behaviour of the conditioned Boolean model.     

计算机实验教学中的“人本化”探讨

本文针对目前计算机实验教学中所面临的学生能动性方面的薄弱环节,从"人本化"的理念角度,分析其产生的根源及影响因素,探讨计算机实验教学的"人本化"这一新课题.     

Some results on generalized ageing classes

In this paper we provide new results about generalized ageing classes on the excess lifetime of a renewal process. We also obtain some characterizations of generalized ageing classes by means of the residual life at random time.     

论西塞罗的历史观

西塞罗在《论演说家》（De Oratore）中阐述了历史的特性、历史的目的以及应该怎样写作历史。他对这一问题的看法没有超出修辞学家的认识范畴，认为历史写作应该强调两个方面，即历史的“真实”和文学的加工，“真实”在他那里其实是“公正”，而文学的渲染则体现了历史应该具有的教化功能。他的历史理论和方法对后来罗马史学的发展产生了深远的影响。     

一种简单的过流过压保护电路

详细介绍了一种实用的过流过压保护电路及工作原理 ,该电路具有可靠性高、反应快等特点     

数学的文化观念与数学教育改革

论述了数学在人类文化中的地位和作用，强调了数学的文化观念对于数学教育改革的重要意义，并就若干问题提出了作者本人的见解．     

Cu~(2+)的柠檬酸配合物与大环配体交换反应的研究

本文在λ=760nm,I=0.5×10~3mol/m~3(KNO_3),T=25℃,[Cu~(2+)]_(tot)=10[CyH]_(tot),和pH为3.30、3.50条件下,测定了大环配体5,5,7,12,12,14-六甲基-1,4,8,11-四氮杂环十四烷-N′-乙酸(简写为CyH)与Cu~(2+)的柠檬酸(LH_3)配合物配体交换反应。用ELORMA等计算程序算出假一级反应的表现速率常数k_(obs)以及双分子反应速率常数k_(Cu)~(CyH)和k_(CuL)~(CyH),且得到了相应的关系式。     

特殊幼儿家长玩具购买行为初探——以成都市为例

通过对成都市特殊幼儿家长玩具购买行为的探究。发现幼儿家长在玩具购买和选择时具有以下特点：家长们在选择玩具时主要考虑的因素大都是“适用性”、“价格”、“幼儿喜爱”、“功能性”等。本文通过对“理想玩具”各项特征的进一步讨论，发现特殊幼儿家长的玩具购买行为可以被界定为四种不同的决策类型。