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161.
162.
中国股市存在诸多市场异象,而其时变性却常被忽视。本文从动态视角出发,基于条件CAPM,研究了中国股市异象的时变特征及影响其变化的经济因素。研究结果表明,即使在条件CAPM下,各类市场异象仍然存在,并且表现出显著的时变性。在样本期内,中国股票市场异象发生了风格转换,以账面市值比异象、市盈率异象为代表的价值型异象正在逐渐减弱甚至消失,而规模、特质波动率、换手率以及市场风险异象正逐渐显现并仍有增强的趋势。同时,规模、账面市值比、市盈率等"基本面类"异象主要受宏观经济因素的影响,反映了更多经济风险的信息;而特质波动率、换手率以及市场风险等"市场类"异象主要受市场因素的影响,此类异象更可能是市场无效的表现。此外,研究还发现,条件β未能捕捉到各多空组合收益率蕴含的经济风险,这是条件CAPM无法解释各市场异象的原因之一。 相似文献
163.
Sahu Sujit K. Dey Dipak K. Aslanidou Helen Sinha Debajyoti 《Lifetime data analysis》1997,3(2):123-137
Frequently in the analysis of survival data, survival times within the same group are correlated due to unobserved co-variates.
One way these co-variates can be included in the model is as frailties. These frailty random block effects generate dependency
between the survival times of the individuals which are conditionally independent given the frailty. Using a conditional proportional
hazards model, in conjunction with the frailty, a whole new family of models is introduced. By considering a gamma frailty
model, often the issue is to find an appropriate model for the baseline hazard function. In this paper a flexible baseline
hazard model based on a correlated prior process is proposed and is compared with a standard Weibull model. Several model
diagnostics methods are developed and model comparison is made using recently developed Bayesian model selection criteria.
The above methodologies are applied to the McGilchrist and Aisbett (1991) kidney infection data and the analysis is performed
using Markov Chain Monte Carlo methods.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
164.
Jeremy M.G. Taylor William G. Cumberland Xiangyi Meng 《Australian & New Zealand Journal of Statistics》1996,38(2):183-191
Power transformations are a popular way to improve the agreement between the observations and the assumptions in a statistical model. In this paper it is assumed that the data, after appropriate power transformation Λ, satisfies a variance components model, with independent Gaussian components. The focus is on inference for quantities which have an interpretation regardless of the choice of Λ (Carroll & Ruppert, 1981) – in particular the intraclass correlation coefficient ρ, the predicted probability of a new observation being less than a specified value and the predicted quantile. It is shown that, in the case Λ= 0, the asymptotic variance of ρ is the same, whether or not one treats Δ as estimated or as known. This supports an empirical conjecture of Solomon (1985). For predicted probabilities and predicted quantiles the variance when A is estimated is shown to be only slightly greater than the variance assuming Δ is known, except in the tails of the distribution where there can be substantial difference between the two variances. 相似文献
165.
H. Ferguson 《Revue canadienne de statistique》1992,20(1):63-75
Inference for a scalar interest parameter in the presence of nuisance parameters is considered in terms of the conditional maximum-likelihood estimator developed by Cox and Reid (1987). Parameter orthogonality is assumed throughout. The estimator is analyzed by means of stochastic asymptotic expansions in three cases: a scalar nuisance parameter, m nuisance parameters from m independent samples, and a vector nuisance parameter. In each case, the expansion for the conditional maximum-likelihood estimator is compared with that for the usual maximum-likelihood estimator. The means and variances are also compared. In each of the cases, the bias of the conditional maximum-likelihood estimator is unaffected by the nuisance parameter to first order. This is not so for the maximum-likelihood estimator. The assumption of parameter orthogonality is crucial in attaining this result. Regardless of parametrization, the difference in the two estimators is first-order and is deterministic to this order. 相似文献
166.
Elias Ould-Saïd 《Scandinavian Journal of Statistics》1997,24(2):231-239
We establish the uniform almost-sure convergence of a kernel estimate of the conditional density for an ergodic process. A useful application to the prediction of the ergodic process via the conditional mode function is also given. 相似文献
167.
Issues that are central to the understanding and management of the HIV epidemic have generated numerous statistical challenges. This paper considers questions concerning the incubation period, the effects of treatments, pre diction of AIDS cases, the choice of surrogate end points for the assessment of treatments and design of strategies for screening blood samples. These issues give rise to a broad range of intriguing problems for statisticians. We describe some of these problems, how they have been tackled so far and what remains to be done. The discussion touches on topical statistical methods such as smoothing, bootstrapping, interval censoring and the ill-posed inverse problem, as well as asking fundamental questions for frequentist statistics. 相似文献
168.
Bayesian methods for estimating the dose response curves with the one-hit model, the gamma multi-hit model, and their modified versions with Abbott's correction are studied. The Gibbs sampling approach with data augmentation and with the Metropolis algorithm is employed to compute the Bayes estimates of the potency curves. In addition, estimation of the relative additional risk and the virtually safe dose is studied. Model selection based on conditional predictive ordinates from cross-validated data is developed. 相似文献
169.
Several estimators, including the classical and the regression estimators of finite population mean, are compared, both theoretically and empirically, under a calibration model, where the dependent variable(y), and not the independent variable(x), can be observed for all units of the finite population. It is shown asymptotically that when conditioned on x, the bias of the classical estimator may be much smaller than that of the regression estimators; whereas when conditioned on y, the regression estimator may have much smaller conditional bias than the classical estimator. Since all the y's(not x's) can be observed, it seems appropriate to make comparison under the conditional distribution of each estimator with y fixed. In this case, the regression estimator has smaller variance, smaller conditional bias, and the conditional coverage probability closer to its nominal level 相似文献
170.
Alastair Hall 《商业与经济统计学杂志》2013,31(4):417-426
In this article, I derive the Lagrange multiplier test of the null hypothesis that a stationary random vector has a (possibly heteroscedastic) normal distribution against the alternative that the distribution is a member of the family with seminonparametric probability density functions considered by Gallant and Tauchen (1989). The test is shown to contain special cases of the moment tests proposed by Newey (1985) and Tauchen (1985). Evidence from a small simulation study is reported, showing that the test has reasonable finite-sample properties in moderately sized samples. The test is applied to the change of price in a treasury-bill data series analyzed by Tauchen and Pitts (1983) and Tauchen (1985). 相似文献