The ultimate goal of this thesis is to construct an optimal global portfolio with ETFs. We choose the iShares MSCI country index ETFs as our assets. We start with the calculation of correlation between these countries. We find out that there is potential benefit undertaking international diversification. While comparing with the former research, the potential benefit is smaller. We examine the effect of investing internationally of each country. And we can see that not all countries are benefit from international diversification. While considering international diversification, investors have to look at the characteristic of the domestic country to make decision. In the international level, we can see that the investment risk would decrease and the return would increase. And the marginal effect decreases. In our test, the return, risk and efficiency come stable after adding the 14th asset into the global portfolio. Therefore we construct our global portfolio with 13 assets. We can see
English abstract Panic disorder is one of the neuroses. Neurosis is the most popular mental disease and the representative of mild mental illness. Foreign research reports reveal that the lifetime prevalence rate of neurosis is about between 20%-50%, but few people accepted clinical treatment. Neuroses (panic, depression, and so on) and cardiac disorder will be the nightmare of causing serious diseases of human life in 2020. Panic disorder (attack) is a quickly and suddenly strong anxiety symptom and like a psychologic disease surrounded by dark and terrible emotion and hard to eliminate it. But by appropriate treatment, panic attack will be eased. Medicine treatment is the most efficient and simplest way for a definite diagnosis panic patient in practice. But due to political issues between China and Taiwan, Taiwan’s poor economy seems getting worse and worse and the health insurance medicine price of Central Health Insurance Bureau is also getting lower and lower. It is increasingly