Estimating function method for product autoregressive models

The first-order product autoregressive (PAR(1)) model introduced by McKenzie in 1982 McKenzie, E. D. (1982). Product autoregression: A time series characterization of the gamma distribution. Journal of Applied Probability 19:463–468. [Google Scholar] did not attract the attention of practitioners due to the unavailability of a proper estimation method. This article proposes an estimating function (EF) method to fill the gap. In particular, we suggest an optimal combination of linear and quadratic EFs to overcome the problem of parameter identification. The procedure is applied to Weibull and Gamma PAR(1) models. Simulation and data analysis show that the proposed method performs better than the existing methods.     

新疆少数民族婚姻家庭的法律问题探析

新疆少数民族婚姻习俗及伊斯兰习惯法与国家现行婚姻法之间存在着基本原则、婚姻成立的实质要件和形式要件等方面的冲突。解决这些问题,必须让国家制定法与伊斯兰习惯法对接,充分协调好国家现行婚姻法律制度及新疆维吾尔自治区补充条例与伊斯兰习惯法的关系,减少或消除二者之间的冲突。     

A new approach to motivation: Four-drive model

ABSTRACT

This article presents a new approach to the field of motivation. To start, it reviews the previously available literature in the field and analyzes some of the more popular theories and finds the gaps. A new model is put forward, which aims to cover the relevant parameters—as well as to plug the identified gaps. The model proposes four types of drives—sensual, material, emotional, and spiritual. A quantitative study was done to validate the proposed theory and to have a better understanding in identifying the socioeconomic parameters that are significant in predicting which drive is likely to dominate in a person. Using the proposed theory and the results from the quantitative analysis, a model for motivation is proposed. This research is part of an ongoing research effort to test, validate, and generalize the proposed model.     

Some weighted mixed portmanteau tests for diagnostic checking in linear time series models

The popular diagnostic checking methods in linear time series models are portmanteau tests based on either residual autocorrelation functions (acf) or partial autocorrelation functions (pacf). In this paper, we device some new weighted mixed portmanteau tests by appropriately combining individual tests based on both acf and pacf. We derive the asymptotic distribution of such weighted mixed portmanteau statistics and study their size and power. It is found that the weighted mixed tests outperform when higher order ARMA models are fitted and diagnostic checks are performed via testing lack of residual autocorrelations. Simulation results suggest to use the proposed tests as complementary to those classical tests found in literature. An illustrative application is given to demonstrate the usefulness of the mixed test.     

Gender Differences in Sexually Abused Children and Adolescents: A Multicenter Study in Turkey

The purpose of this study was to examine gender-based differences in abuse-related characteristics and post-abuse psychiatric disorders among sexually abused children and adolescents. The researchers retrospectively examined files, judicial reports, and social examination reports of 1,250 sexually abused youth cases. Results showed that boys were more often victimized by penetration, force, and physical violence. Incidence of sexual abuse by family members, familiar persons, and multiple persons was higher among girls. In addition, a higher rate of major depressive disorder as well as alcohol consumption and cigarette smoking were found in sexually abused girls. No difference was observed between boys and girls in terms of post-traumatic stress disorder, conduct disorder, and other mental disorders. Intellectual disability was more frequent in boys.     

A comparison of count data models with an application to daily cigarette consumption of young persons

The objective of this study is providing a comparative assessment for researchers to deal with the challenges of analyzing count data and examining the factors associated with daily cigarette consumption among the young people in Turkey. We fitted Poisson (P), negative binomial (NB), zero-inflated Poisson (ZIP), zero-inflated negative binomial (ZINB), Poisson hurdle (PH) and negative binomial hurdle (NBH) regressions to cigarette consumption count data by using the 2014 Turkey Health Survey. Our results showed that the ZINB and NBH models should be preferred. We also found that, gender, employment and tobacco use at home are more effective factors for smokers and nonsmokers in the 15–24 age group in Turkey.