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891.
892.
根据不同类型的ARCH类模型的特点及其所刻画的市场波动特征,本文对中国证券投资基金市场波动的聚集性进行检验,分别运用EGARCH和TGARCH模型对证券投资基金波动的非对称性和杠杆效应进行实证研究,运用EGARCH-M模型对证券投资基金波动的风险溢价效应进行实证分析,运用改进的EGARCH模型对证券投资基金波动与信息的关系进行实证研究,并对实证结果进行分析. 相似文献
893.
Pavel Zimmermann 《Mathematical Population Studies》2017,24(3):172-180
Several models of old age mortality with time-varying parameters are expressed in a single formula. In these models, the existence of an age threshold above which mortality increases over time and below which mortality decreases over time is problematic. The conditions of appearance of this threshold are expressed and shown on logistic and exponential models with empirical data. The conditions of appearance of the threshold reflect actual situations in developed countries. Richards’ curve avoids the appearance of the threshold with empirical data. 相似文献
894.
Edward W. Frees 《Revue canadienne de statistique》2001,29(4):573-595
The omission of important variables is a well‐known model specification issue in regression analysis and mixed linear models. The author considers longitudinal data models that are special cases of the mixed linear models; in particular, they are linear models of repeated observations on a subject. Models of omitted variables have origins in both the econometrics and biostatistics literatures. The author describes regression coefficient estimators that are robust to and that provide the basis for detecting the influence of certain types of omitted variables. New robust estimators and omitted variable tests are introduced and illustrated with a case study that investigates the determinants of tax liability. 相似文献
895.
This paper considers the analysis of round robin interaction data whereby individuals from a group of subjects interact with one another, producing a pair of outcomes, one for each individual. The authors provide an overview of the various analyses applied to these types of data and extend the work in several directions. In particular, they provide a fully Bayesian analysis for such data and use a real data example for illustration purposes. 相似文献
896.
Kert Viele 《Revue canadienne de statistique》2001,29(1):51-66
The author proposes a general method for evaluating the fit of a model for functional data. His approach consists of embedding the proposed model into a larger family of models, assuming the true process generating the data is within the larger family, and then computing a posterior distribution for the Kullback‐Leibler distance between the true and the proposed models. The technique is illustrated on biomechanical data reported by Ramsay, Flanagan & Wang (1995). It is developed in detail for hierarchical polynomial models such as those found in Lindley & Smith (1972), and is also generally applicable to longitudinal data analysis where polynomials are fit to many individuals. 相似文献
897.
社会统计分析是社会研究方法中十分重要的一部分,因为定量研究所得的原始资料在经过审核、整理与汇总之后,需要进行科学系统的统计分析,才能揭示出研究资料所包含的众多信息,从而得出研究的结论。在多元统计分析方法中,研究者用得比较多的是多元线性回归分析、方差分析、log线性模型、probit模型及logistic回归分析,这些分析方法能够帮助我们对数据进行简化、对变量之间的相互依赖关系进行分析,以及根据模型进行预测。但上述方法也存在着一定的使用局限性,比如,方差分析法要假定进行均值比较的总体具有相同的方差和服从正态分布,如果不符合… 相似文献
898.
在以往比较长的一段时间内,许多中国学者或理论工作者都比较喜欢进行概念上的争论。这种争论某种意义上颇类似于西方中世纪对宗教教义的不同理解引发的辩驳,它对于正本清源,明晰人们的认知,改变意识形态,形成一种共识,促进社会转型是有较大作用的。不过,这样的学术活动,其实对于学术的直接的建设性作用甚小。当前中国学术界,这种现象少了一些,学者们转而满足于对经验进行简要概括,以期形成一定的能够唤起读者共鸣的概念。这些概念往往能够引起一定的社会效应,然而,其学术意义同样不大,因为它们对于真正的学术累积作用甚小。众所周知的是:仅… 相似文献
899.
Lisa Strohschein 《Journal of marriage and the family》2005,67(5):1286-1300
A process‐oriented approach to parental divorce locates the experience within the social and developmental context of children's lives, providing greater insight into how parental divorce produces vulnerability in some children and resiliency in others. The current study involves prospectively tracking a nationally representative sample of Canadian children of ages 4–7 and living with two biological parents at initial interview in 1994 (N = 2,819), and comparing the mental health trajectories of children whose parents remain married with those whose parents divorce by 1998. Results from growth curve models confirm that, even before marital breakup, children whose parents later divorce exhibit higher levels of anxiety/depression and antisocial behavior than children whose parents remain married. There is a further increase in child anxiety/depression but not antisocial behavior associated with the event of parental divorce itself. Controlling for predivorce parental socioeconomic and psychosocial resources fully accounts for poorer child mental health at initial interview among children whose parents later divorce, but does not explain the divorce‐specific increase in anxiety/depression. Finally, a significant interaction between parental divorce and predivorce levels of family dysfunction suggests that child antisocial behavior decreases when marriages in highly dysfunctional families are dissolved. 相似文献
900.
Len Thomas Stephen T. Buckland Ken B. Newman John Harwood 《Australian & New Zealand Journal of Statistics》2005,47(1):19-34
This paper proposes a unified framework for defining and fitting stochastic, discrete‐time, discrete‐stage population dynamics models. The biological system is described by a state‐space model, where the true but unknown state of the population is modelled by a state process, and this is linked to survey data by an observation process. All sources of uncertainty in the inputs, including uncertainty about model specification, are readily incorporated. The paper shows how the state process can be represented as a generalization of the standard Leslie or Lefkovitch matrix. By dividing the state process into subprocesses, complex models can be constructed from manageable building blocks. The paper illustrates the approach with a model of the British grey seal metapopulation, using sequential importance sampling with kernel smoothing to fit the model. 相似文献