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311.
In this paper, we consider the family of skew generalized t (SGT) distributions originally introduced by Theodossiou [P. Theodossiou, Financial data and the skewed generalized t distribution, Manage. Sci. Part 1 44 (12) ( 1998), pp. 1650–1661] as a skew extension of the generalized t (GT) distribution. The SGT distribution family warrants special attention, because it encompasses distributions having both heavy tails and skewness, and many of the widely used distributions such as Student's t, normal, Hansen's skew t, exponential power, and skew exponential power (SEP) distributions are included as limiting or special cases in the SGT family. We show that the SGT distribution can be obtained as the scale mixture of the SEP and generalized gamma distributions. We investigate several properties of the SGT distribution and consider the maximum likelihood estimation of the location, scale, and skewness parameters under the assumption that the shape parameters are known. We show that if the shape parameters are estimated along with the location, scale, and skewness parameters, the influence function for the maximum likelihood estimators becomes unbounded. We obtain the necessary conditions to ensure the uniqueness of the maximum likelihood estimators for the location, scale, and skewness parameters, with known shape parameters. We provide a simple iterative re-weighting algorithm to compute the maximum likelihood estimates for the location, scale, and skewness parameters and show that this simple algorithm can be identified as an EM-type algorithm. We finally present two applications of the SGT distributions in robust estimation. 相似文献
312.
Ali İ. Genç 《Statistics》2013,47(3):613-625
In this work, we generalize the Birnbaum–Saunders distribution using the generalized t distribution alternatively to the normal distribution. The newly defined family is positively skewed and contains distributions with different kurtosis and skewness. We study its properties and special cases and demonstrate its use on some real data sets considering the maximum-likelihood estimation procedure. 相似文献
313.
We derive a generalization of the exponential distribution by making log transformation of the standard two-sided power distribution. We show that this new generalization is in fact a mixture of a truncated exponential distribution and truncated generalized exponential distribution introduced by Gupta and Kundu [Generalized exponential distributions. Aust. N. Z. J. Stat. 41(1999):173–188]. The newly defined distribution is more flexible for modeling data than the ordinary exponential distribution. We study its properties, estimate the parameters, and demonstrate it on some well-known real data sets comparing other existing methods. 相似文献
314.
Yaçin Tuncer 《统计学通讯:理论与方法》2013,42(2):393-400
Given that estimators are monotone functions of observations, parametric identiflability is shown to be both necessary and sufficient for estimability. 相似文献
315.
In this paper, efficient importance sampling (EIS) is used to perform a classical and Bayesian analysis of univariate and multivariate stochastic volatility (SV) models for financial return series. EIS provides a highly generic and very accurate procedure for the Monte Carlo (MC) evaluation of high-dimensional interdependent integrals. It can be used to carry out ML-estimation of SV models as well as simulation smoothing where the latent volatilities are sampled at once. Based on this EIS simulation smoother, a Bayesian Markov chain Monte Carlo (MCMC) posterior analysis of the parameters of SV models can be performed. 相似文献
316.
In this article we consider the modified Shewhart control chart for ARCH processes and introduce it for threshold ARCH (TARCH) ones. For both charts, we determine bounds for the distribution of the in-control run length (RL) and, consequently, for its average (ARL), both depending only on the distribution of the generating white noise, the model parameters and the critical value. For the ARCH model, we compare our bounds with others available in literature and show how they improve the existing ones. We present a simulation study to assess the quality of the bounds calculated for the ARL. 相似文献
317.
Michal Myck Olivier Bargain Miriam Beblo Denis Beninger Richard Blundell Raquel Carrasco Maria-Concetta Chiuri François Laisney Valérie Lechene Ernesto Longobardi Nicolas Moreau Javier Ruiz-Castillo Frederic Vermeulen 《Review of Economics of the Household》2006,4(2):129-158
A framework for simplified implementation of the collective model of labor supply decisions is presented in the context of
fiscal reforms in the UK. Through its collective form the model accounts for the well known problem of distribution between
wallet and purse, a broadly debated issue which has so far been impossible to model due to the limitations of the unitary
model of household behavior. A calibrated data set is used to model the effects of introducing two forms of the Working Families’
Tax Credit. We also summarize results of estimations and calibrations obtained using the same methodology on data from five
other European countries. The results underline the importance of taking account of the intrahousehold decision process and
suggest that who receives government transfers does matter from the point of view of labor supply and welfare of household
members. They also highlight the need for more research into models of household behavior.
相似文献
Michal MyckEmail: |
318.
Collective Models of Labor Supply with Nonconvex Budget Sets and Nonparticipation: A Calibration Approach 总被引:1,自引:0,他引:1
Frederic Vermeulen Olivier Bargain Miriam Beblo Denis Beninger Richard Blundell Raquel Carrasco Maria-Concetta Chiuri François Laisney Valérie Lechene Nicolas Moreau Michal Myck Javier Ruiz-Castillo 《Review of Economics of the Household》2006,4(2):113-127
We suggest a methodology to calibrate a collective model with household-specific bargaining rules and marriage-specific preferences
that incorporate leisure externalities. The empirical identification relies on the assumption that some aspects of individual
preferences remain the same after marriage, so that estimation on single individuals can be used. The procedure maps the complete
Pareto frontier of each household in the dataset and we define alternative measures of a power index. The latter is then regressed
on relevant bargaining factors, including a set of variables retracing the potential relative contributions of the spouses
to household disposable income. In its capacity to handle complex budget sets and labor force participation decisions of both
spouses, this framework allows the comparison of unitary and collective predictions of labor supply reactions and welfare
changes entailed by fiscal reforms in a realistic setting (see Michal Myck et al., 2006; Denis Beninger et al., 2006).
相似文献
Frederic VermeulenEmail: |
319.
We present a Bayesian approach to the problem of estimating density matrices in quantum state tomography. A general framework is presented based on a suitable mathematical formulation, where a study of the convergence of the Monte Carlo Markov Chain algorithm is given, including a comparison with other estimation methods, such as maximum likelihood estimation and linear inversion. This analysis indicates that our approach not only recovers the underlying parameters quite properly, but also produces physically acceptable punctual and interval estimates. A prior sensitive study was conducted indicating that when useful prior information is available and incorporated, more accurate results are obtained. This general framework, which is based on a reparameterization of the model, allows an easier choice of the prior and proposal distributions for the Metropolis–Hastings algorithm. 相似文献
320.
To deal with multicollinearity problem, the biased estimators with two biasing parameters have recently attracted much research interest. The aim of this article is to compare one of the last proposals given by Yang and Chang (2010) with Liu-type estimator (Liu 2003) and k ? d class estimator (Sakallioglu and Kaciranlar 2008) under the matrix mean squared error criterion. As well as giving these comparisons theoretically, we support the results with the extended simulation studies and real data example, which show the advantages of the proposal given by Yang and Chang (2010) over the other proposals with increasing multicollinearity level. 相似文献