The empirical likelihood-based
inference for varying coefficient models with missing covariates is
investigated. An imputed empirical likelihood ratio function for the
coefficient functions is proposed, and it is shown that iis limiting
distribution is standard chi-squared. Then the corresponding confidence
intervals for the regression coefficients are constructed. Some simulations
show that the proposed procedure can attenuate the effect of the missing data,
and performs well for the finite sample.
Objective: To investigate the characteristics and the precaution of and reduction of sport injuries among college students in Wuhan, and to provide evidence for the prevention. Methods: Stratified and cluster random sampling method was used to choose 1103 students from a university in Wuhan. A self-designed questionnaire was used to investigate the characteristics of sport injuries among172 college students who had experienced sport injuries. Results: The incidence of sport injuries among college students in Wuhan was 15.59%. Sport injuries were closely related with sports events, sports technique, physical condition of exerciser, and ground equipment. The incidence of sport injuries was higher in basketball, soccer and physical fitness exercise. Sport injuries were mainly soft tissue damage. The locations of injuries were primary in ankle joint (56.69%). Injuries induced by basketball & soccer were prone to occur in physical education class, while injuries caused by physical fitness exercise were prone to occur in extracurricular activities. Conclusion: The incidence of sport injuries was higher in basketball & soccer, and sport injuries were prone to occur in physical education class. It was imperative to strengthen the measures of prevention and intervention in college sport injuries.
In this paper, we have tested the
relationship between the stock returns, corporate performance and investment
risks with the sample of listed companies in the agricultural, construction and
financial industries in the A-share stock market. Descriptive statistical
analysis, correlation test and regression analysis indicate that there is no
relationship between stock returns and corporate performance, but there exists
a positive correlation between the stock returns and investment risks in the
construction and financial industries.
With the reform and opening up of china,
and the globalization of economy, Chinese enterprises are facing more and more complex
financial environment, especially since 2008 financial crisis, the government's
macro-control, the relative appreciation of RMB, rising labor costs and other
non-financial constraints factors, have greatly changed the financial
management content, objectives, theory, methods, and ways of working etc,
enterprises financial management are suffering from a huge challenge. This
paper analyzes the main problems of Chinese enterprises in financial
management, and gives some suggestions to work out these problems.