A new long-term survival model with dispersion induced by discrete frailty

Lifetime Data Analysis - Frailty models are generally used to model heterogeneity between the individuals. The distribution of the frailty variable is often assumed to be continuous. However, there...     

A general long-term aging model with different underlying activation mechanisms: Modeling,Bayesian estimation,and case influence diagnostics

In this paper we propose a general cure rate aging model. Our approach enables different underlying activation mechanisms which lead to the event of interest. The number of competing causes of the event of interest is assumed to follow a logarithmic distribution. The model is parameterized in terms of the cured fraction which is then linked to covariates. We explore the use of Markov chain Monte Carlo methods to develop a Bayesian analysis for the proposed model. Moreover, some discussions on the model selection to compare the fitted models are given, as well as case deletion influence diagnostics are developed for the joint posterior distribution based on the ψ-divergence, which has several divergence measures as particular cases, such as the Kullback–Leibler (K-L), J-distance, L₁ norm, and χ²-square divergence measures. Simulation studies are performed and experimental results are illustrated based on a real malignant melanoma data.     

UNDERSTANDING THE COSTS OF CONSUMER DURABLE ADJUSTMENTS

This article examines whether adjustment frictions help account for the patterns of household consumption expenditures observed in the Consumer Expenditure Survey, namely, that the variance of log durable expenditure is four times larger than that of log nondurable expenditure for annual data and this gap substantially widens for quarterly data. Estimating a structural model of household consumption with nondurable and durable goods with the simulated method of moments, I find that the fixed costs associated with durable adjustments are important in matching the cross‐sectional moments. Using the estimated model, I also examine the response of nondurable and durable expenditures to income shocks. (JEL D12, D91, E21)     

A Bayesian approach for zero-modified Skellam model with Hamiltonian MCMC

Statistical Methods & Applications - In this paper is presented the zero-modified poisson difference and present possible applications of them in the analysis of paired count data. The...     

藏语方言学研究与语言地图：如何看待“康方言”

本文介绍藏语方言学研究中的地理语言学的研究方法,并利用此方法对所谓的藏语“康方言”进行分析,探讨其具体语言现象,并提出在以往藏语研究中常见的“康方言”并不成立,应将其理解为“语言复合体”之见解.由于方言学研究涉及的领域除了语言本身之外,还需要考虑地理关系及历史关系,其研究不同于普通的方言研究.本文主要讨论有关“康方言”的三个问题,通过实际问题的讨论了解到,方言学研究中绘制语言地图是一种不可回避的过程,通过地图能了解到各个方言群的分布地域,并加上地理、历史等人文信息探讨方言的形成,才能得到可信的方言分类.     

Asymptotic distribution of regression correlation coefficient for Poisson regression model

This study treats an asymptotic distribution for measures of predictive power for generalized linear models (GLMs). We focus on the regression correlation coefficient (RCC) that is one of the measures of predictive power. The RCC, proposed by Zheng and Agresti is a population value and a generalization of the population value for the coefficient of determination. Therefore, the RCC is easy to interpret and familiar. Recently, Takahashi and Kurosawa provided an explicit form of the RCC and proposed a new RCC estimator for a Poisson regression model. They also showed the validity of the new estimator compared with other estimators. This study discusses the new statistical properties of the RCC for the Poisson regression model. Furthermore, we show an asymptotic normality of the RCC estimator.     

How U.S. and Japanese CEO's spend their time

Managing Directors (CEOs) in a number of large U.S. and Japanese corporations were asked to write a detailed diary of a typical working day, and they were asked what kind of information was useful for certain kinds of decisions. Some of the results of the survey are described in this article. It was found that the average age of the CEOs in the two countries was about the same—60 years old, but CEOs in the United States stayed longer in the position than Japanese CEOs because they were promoted at a younger age. CEOs in the United States worked a longer day than the Japanese. American chief executives spent about 3 hours longer in meetings than their Japanese counterparts. In Japanese corporations the information is distributed and the negotiating is done beforehand, so meetings tend to be shorter. In America contacts with businessmen outside the company were important sources of information, for strategic decisions in particular.