检索结果-南通市图书馆

A Study on the Role of Tourism in Enhancing Personal Mental Health in the Post-Epidemic Era

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mental Health Promotion 2024年第4期26卷 325-334页

作者： Ruiqin Tian Yue Feng Lingqi Zhan School of Mathematics Hangzhou Normal UniversityHangzhou311121China

With the advent of the post-epidemic era,a great wave of tourism has been ushered in *** relationship between tourism and mental health has become a hot topic in *** paper investigates the enhancement of people’s mental health after tourism through social *** Hangzhou as the sample collection site,this paper conducted a study on the role of tourism in enhancing personal mental health through descriptive analysis,factor analysis and structural equation modeling,and further specifically analyzed the role of mediating *** results showed that:(1)The purpose of tourism is to relax and relieve stress,and the effectiveness of tourism is mainly reflected in the alleviation of emotional conditions;(2)Factor Analysis reduced the dimensionality of personal mental health indicators,and finally obtained four factors,among which the comprehensive behavioral ability and physiological manifestation had the best improvement effect after tourism;(3)The structural equation model shows that the enhancing effect of tourism on mental health originates from the factor of inner psychological characteristic,and this factor works through two paths:Inner Psychological Characteristic-Social Adaptability-Physiological Manifestations-Enhancement of Mental Health by Tourism,and Inner Psychological Characteristic-Comprehensive Behavioral Ability-Enhancement of Mental Health by Tourism;(4)Tourism has an enhancing effect on personal mental health,and the enhancing effect is most significant among the middle-aged and young people who are unmarried and do not have children *** results have been reasonably analyzed and explained,and relevant suggestions are put forward.

关键词： Tourism mental health factor analysis structural equation model enhancement

Who Are the Elites in the Venture Capital Industry?-Investigation of Elite-Club Boundary in a Co-Investment Network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Social Computing 2024年第2期5卷 145-164页

作者： Yu Zhang Hu Yang the Department of Sociology Tsinghua UniversityBeijing 100084China the School of Information Central University of Finance and EconomicsBeijing 102206China

Existing research suggests that elite clubs exist in venture capital markets,but a standard for determining their size and composition is *** paper addresses this challenge by using the weighted k-means sorting algorithm to construct a research framework for elite *** the framework with investment events data from China’s venture capital market(2001-2018),intriguing findings *** ranking of Venture Capitalists(VCs)follows a power-law distribution,providing evidence for elite clubs’*** analysis identifies a turning point in the score curve,serving as a valuable indicator for club *** clubs demonstrate relatively high stability,maintaining advantages and elite status in future *** validation confirms the proposed framework’s superior stability compared to existing ***,elite club members outperform non-elites *** paper effectively identifies elite clubs in the Chinese venture capital market,helping other VCs recognize potential partners,access high-quality information,and enhance investment performance.

关键词： venture capital co-investment network elite club boundary ranking

A Simulation-Extrapolation Approach to the Analysis of Interval-Censored Failure Time Data with Mis-Measured Covariates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems science & Complexity 2024年

作者： FENG Fan ZHAO Shishun LI Shuwei SUN Jianguo School of Economics and Statistics Guangzhou University School of Mathematics Jilin University School of Mathematics Jilin University Department of Statistics University of Missouri

Interval-censored failure time data arise frequently in periodical follow-up studies including clinical trials and epidemiological surveys. In addition, some covariates may be subject to measurement errors due to the instrumental contamination, biological variation or other reasons. For the analysis of interval-censored data with mis-measured covariates, the existing methods either assume a parametric model or rely on the availability of replicated surrogate measurements for the error-prone covariate, which both have obvious limitations. To overcome these shortcomings, the authors propose a simulation-extrapolation estimation procedure under a general class of transformation models. The resulting estimators are shown to be consistent and asymptotically normal. The numerical results obtained from a simulation study indicate that the proposed method performs reasonably well in *** particular, the proposed method can reduce the estimation bias given by the naive method that does not take measurement errors into account. Finally, the proposed method is applied to a real data set on hypobaric decompression sickness.

关键词：

Cholesky GAS models for large time-varying covariance matrices

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Management science and Engineering 2024年第1期9卷 115-142页

作者： Tingguo Zheng Shiqi Ye Department of Statistics and Data science School of EconomicsXiamen UniversityXiamen361005China Wang Yanan Institute for Studies in Economics Xiamen UniversityXiamen361005China Paula and Gregory Chow Institute for Studies in Economics Xiamen UniversityXiamen361005China

This paper develops a new class of multivariate models for large-dimensional time-varying covariance matrices,called Cholesky generalized autoregressive score(GAS)models,which are based on the Cholesky decomposition of the covariance matrix and assume that the parameters are ***,two types of score-driven updates are considered:one is closer to the GARCH family,and the other is inspired by the stochastic volatility *** demonstrate that the models can be estimated equation-wise and are computationally feasible for high-dimensional ***,we design an equationwise dynamic model averaging or selection algorithm which simultaneously extracts model and parameter uncertainties,equipped with dynamically estimated model *** simulation results illustrate the superiority of the proposed ***,using a sizeable daily return dataset that includes 124 sectors in the Chinese stock market,two empirical studies with a small sample and a full sample are conducted to verify the advantages of our *** full sample analysis by a dynamic correlation network documents significant structural changes in the Chinese stock market before and after COVID-19.

关键词： Cholesky decomposition GAS Dynamic conditional correlations Dynamic model averaging

Entrepreneurial Spirit for China in the New Era and Strategies for Cultivation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Economist 2024年第5期19卷 48-59页

作者： Xu Yuanhua He Jun Sun Zao Li Xiaoke School of Economics Lanzhou UniversityLanzhouChina Institute of Industrial Economics Chinese Academy of Social Sciences(IIE-CASS)BeijingChina School of Economics and Finance Xi’an Jiaotong UniversityXi’anChina School of Economics Zhongnan University of Economics and LawWuhanChina

What type of entrepreneurial spirit is needed for China’s new era,and how can we unlock its innovation potential?Answers to these questions will unleash vital forces to drive China’s high-quality economic *** reviewing the theories,dimensions,features,and limitations of the entrepreneurial spirit in the Western context,we concluded that the entrepreneurial spirit in China’s new era,which is characterized by patriotism,innovation,trustworthiness,adherence to the law,fulfillment of social responsibilities,and a global horizon,has overcome the limitations that come with self-interested entrepreneurship in the context of Western *** is a major step forward in the development of theories on entrepreneurial *** the development context of the new era,this paper argues that the entrepreneurial spirit should become an important force at the individual level to implement the new development concept,foster the new development paradigm,and promote high-quality development in the new *** paper provides answers to the question of what type of entrepreneurial spirit China’s new era ***,this paper presents basic strategies for cultivating entrepreneurial spirit in the context of China’s new era,emphasizing the importance to promote the healthy growth of young entrepreneurs,ensure their business autonomy,develop a multi-tiered capital market,implement the factor market reforms,improve the business climate,and accelerate the digital transition.

关键词： Context of China’s new era context of Western economics entrepreneurial spirit high-quality development cultivation strategy

A statistical inference for generalized Rayleigh model under Type-Ⅱ progressive censoring with binomial removals

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2020年第1期31卷 206-223页

作者： REN Junru GUI Wenhao Department of Mathematics Beijing Jiaotong University

This paper considers the parameters and reliability characteristics estimation problem of the generalized Rayleigh distribution under progressively Type-Ⅱ censoring with random removals,that is,the number of units removed at each failure time follows the binomial *** maximum likelihood estimation and the Bayesian estimation are *** the meanwhile,through a great quantity of Monte Carlo simulation experiments we have studied different hyperparameters as well as symmetric and asymmetric loss functions in the Bayesian estimation procedure.A real industrial case is presented to justify and illustrate the proposed *** also investigate the expected experimentation time and discuss the influence of the parameters on the termination point to complete the censoring test.

关键词： Type-Ⅱprogressive censoring with random removals generalized Rayleigh distribution reliability characteristic maximum likelihood estimation Markov chain Monte Carlo method expected experimentation time

The Analysis of Impact of Brexit on the Post-Brexit EU Using Intervented Multivariate Time Series

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2021年第3期37卷 441-458页

作者： Yu TIAN Shao-pei MA Rong-xiang RUI Zhen YU Mao-zai TIAN Institute for Diplomacy and International Governance Loughborough University LondonE203BSUK Center for Applied Statistics School of StatisticsRenmin University of ChinaBeijing 100872China College of Medical Engineering and Technology Xinjiang Medical UniversityUrumqi 830011China School of Statistics and Data science Xinjiang University of Finance and EconomicsUrumqi 830012China School of Statistics Lanzhou University of Finance and EconomicsLanzhou 730101China

The UK is the most important partner of the EU in terms of economic and other fields due to the geographical *** was one of the largest economies in the EU and its per capita income is higher than the EU average,so it is a net contributor to the *** UKs membership of the EU ended on 31 January 2019,there are concerns that the Brexit may have a significant impact on the EU,resulting in social,economic,political,and institutional changes,*** *** the impact of Brexit on the UK has always been the subject of considerable scholarly interest in recent years,there is relatively little literature on the impact of Brexit on the *** paper focuses on the evaluation of the impact of Brexit on the EU economy and other relevant aspects along three dimensions:GDP,PPP,Quarterly GDP *** powerful quantitative analysis technology that includes vector autoregression model,multivariate time series model with intervention variables,and autoregression integrated moving average,this paper obtains the important and novel evidence about the potential impact of Brexit on the EU economy,pointing out that Brexit is of far-reaching significance to the *** analysis uses several statistical models to screen out several key influencing factors,which can be used to predict the total GDP of EU in the next five *** results show that EU economy will react negatively to"no-deal"Brexit,and its growth rate of economy will slow down significantly in next 5 ***,we put forward relevant policy suggestions on how to deal with the negative impact of Brexit on EU.

关键词： intervention multivariate time series model Brexit economy gaping Brexit hole no-deal Brexit post-Brexit EU

Estimating Restricted Common Structural Changes for Panel Data

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2019年第4期35卷 893-908页

作者： Li-wen ZHANG Zhong-yi ZHU School of Statistics and Management Shanghai University of Finance and Economics Shanghai 200444 China Department of Statistics School of Management Fudan University Shanghai 200433 China

We consider estimating multiple structural changes occurring at unknown common dates in a panel data regression model with restrictions imposed on the coefficients. We establish the consistency and rate of convergence of the structural change estimates and the asymptotic distribution of the parameter *** is shown that the efficiency of the parameter estimators is increased using the restrictions. An efficient dynamic algorithm is proposed to obtain the break date estimates and the parameter estimates. In addition, we propose a testing procedure for the existence of the change points with the restrictions and derive the asymptotic distribution under the null hypothesis of the test statistics. Simulation studies are presented to investigate the performance of the proposed method in finite samples.

关键词： common structural changes panel data consistency

The Asymptotic Behavior of the Ruin Probability within a Random Horizon

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2004年第2期20卷 353-356页

作者： TaoJiang Chen-mingXu SchoolofFinance NanjingUniversityofFinanceandEconomicsNanjing210003JiangsuChina

Subject to the assumption that the common distribution of claim sizes belongs to the extendedregular variation class,the present work obtains a simple asymptotic formula for the ruin probability within arandom or nonr... 详细信息

关键词： Asymptotics extended regular variation class finite time ruin probability renewal model