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41.
For randomly censored data, the authors propose a general class of semiparametric median residual life models. They incorporate covariates in a generalized linear form while leaving the baseline median residual life function completely unspecified. Despite the non‐identifiability of the survival function for a given median residual life function, a simple and natural procedure is proposed to estimate the regression parameters and the baseline median residual life function. The authors derive the asymptotic properties for the estimators, and demonstrate the numerical performance of the proposed method through simulation studies. The median residual life model can be easily generalized to model other quantiles, and the estimation method can also be applied to the mean residual life model. The Canadian Journal of Statistics 38: 665–679; 2010 © 2010 Statistical Society of Canada 相似文献
42.
本文主要是在二项分布,多项分布,负二项分布的基础上,把负二项分布进一步推广,给出负N项分布的定义,推导出它的概率分布,并计算出其数学期望和方差. 相似文献
43.
Vittorio Addona Masoud Asgharian David B. Wolfson 《Revue canadienne de statistique》2009,37(2):206-218
For many diseases, logistic constraints render large incidence studies difficult to carry out. This becomes a drawback, particularly when a new study is needed each time the incidence rate is investigated in a new population. By carrying out a prevalent cohort study with follow‐up it is possible to estimate the incidence rate if it is constant. The authors derive the maximum likelihood estimator (MLE) of the overall incidence rate, λ, as well as age‐specific incidence rates, by exploiting the epidemiologic relationship, (prevalence odds) = (incidence rate) × (mean duration) (P/[1 ? P] = λ × µ). The authors establish the asymptotic distributions of the MLEs and provide approximate confidence intervals for the parameters. Moreover, the MLE of λ is asymptotically most efficient and is the natural estimator obtained by substituting the marginal maximum likelihood estimators for P and µ into P/[1 ? P] = λ × µ. Following‐up the subjects allows the authors to develop these widely applicable procedures. The authors apply their methods to data collected as part of the Canadian Study of Health and Ageing to estimate the incidence rate of dementia amongst elderly Canadians. The Canadian Journal of Statistics © 2009 Statistical Society of Canada 相似文献
44.
Becker and Barro (1988) formulated a theoretical model which identified a range of macroeconomic variables which can temporarily
or permanently affect fertility in small open economies. This article tests the Becker-Barro model with relevant data which
covers most of the 20th century for two small open economies, namely The Netherlands and New Zealand. The results show that
government subsidies for having children have a strong positive effect on fertility, while the provision of public pensions
has a strong negative effect. The degree of intergenerational altruism appears to have been declining. Moreover, there is
only weak support for the hypothesis that real interest rates positively influence fertility.
Received: 2 March 1998/Accepted: 1 September 1999 相似文献
45.
李国芳 《燕山大学学报(哲学社会科学版)》2006,7(2):64-71
自从1938年底中共中央做出发展华中的决策后,皖南和江南的战略地位开始下降,华中逐渐成为新四军发展的重要战略支点。为此,皖南新四军必须北移以作支援。而国民党政府以中央政府的身份迭次发出命令,必欲将中共军队驱逐出华中。国共在华中,尤其是苏北的冲突日渐激烈。《中央提示案》和“皓电”发出后,中共中央并未屈服于国民党的压力,相反加紧发展华中,并要皖南方面做好北移准备,试图以此让步缓解双方矛盾。但就在中共试图缓和国共关系之时,苏北的曹甸战斗却使双方更形紧张,也使皖南新四军直接北渡长江成为其唯一选择。就在皖南新四军北移途中,皖南事变发生了。 相似文献
46.
RNA干扰(RNAi)是指具有同源性的双链RNA导致靶mRNA发生序列特异性降解的现象。随着对RNAi分子机制研究的深入,该技术在哺乳动物的实现策略不断改进,最初是以化学方法合成小干扰RNA(siRNA),目前则包括化学合成法、体外转录法、RNaseⅢ家族体外消化法、表达载体法和PCR制备siRNA表达框法等。本文将对PCR制备siRNA表达框法的原理以及具体过程以及其特点还有运用作一详细综述。 相似文献
47.
从词类范畴化理论看“副词+名词”结构 总被引:1,自引:0,他引:1
聂科丰 《重庆交通学院学报(社会科学版)》2008,(5):119-123
不少学者对汉语中所谓的“副词+名词”结构从各方面进行了研究,但是无一质疑该结构中心词的词类判断。对刘正光等人提出的观点提出质疑,认为:汉语词类的判断不能依赖于直觉或语义,而应在使用大型汉语语料库的基础上,依据词的语法功能来确定;词类范畴化是动态的过程,包括去范畴化和再范畴化,再范畴化是去范畴化的最终结果;对于“副词+名词”结构中发生的词类去范畴化,语法转喻是其内在运作机制。 相似文献
48.
Let X be a discrete random variable the set of possible values (finite or infinite) of which can be arranged as an increasing sequence of real numbers a1<a2<a3<…. In particular, ai could be equal to i for all i. Let X1n≦X2n≦?≦Xnn denote the order statistics in a random sample of size n drawn from the distribution of X, where n is a fixed integer ≧2. Then, we show that for some arbitrary fixed k(2≦k≦n), independence of the event {Xkn=X1n} and X1n is equivalent to X being either degenerate or geometric. We also show that the montonicity in i of P{Xkn = X1n | X1n = ai} is equivalent to X having the IFR (DFR) property. Let ai = i and . We prove that the independence of {X2n ? X1n ∈B} and X1n for all i is equivalent to X being geometric, where B = {m} (B = {m,m+1,…}), provided G(i) = qi?1, 1≦i≦m+2 (1≦i≦m+1), where 0<q<1. 相似文献
49.
Charles F. Doran 《Journal of Policy Modeling》1979,1(3):413-424
Collapse of the Shah's regime has transformed Iran's attitude regarding oil production policy. The nature of OPEC leadership is changing as well. Three models examine the nature of this leadership inside OPEC: (1) the conventional price leadership model, (2) a model emphasizing a concept of egalitarian leadership, and (3) a team model composed of coalitions. The three models establish the limits within which OPEC leadership is exercised. A composite model drawing upon all three sets of results suggests that Saudi Arabia shapes cartel policy not by itself, but through a dominant coalition of states. For most of the period 1969–1978 this coalition has been stable. Following the unsettling changes of 1973, cooptation of Iran into the dominant coalition in 1974 was an important step in achieving a new level of stability. But during the turbulence of regime transformation in Iran, the nature of the governing coalition appears to have changed. One consequence may be that in the future Saudi Arabia will yield more willingly to arguments heard within OPEC on behalf of upwards price pressure, especially in an atmosphere of growing political isolation and overall tight supply. 相似文献
50.
杨雄 《江汉大学学报(人文科学版)》1996,(3)
本文根据近年来基因组分析和RNA研究的进展,从几个不同角度论证了RNA是最早出现的基因组,阐述了RNA在遗传物质演化中的地位. 相似文献