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排序方式: 共有161条查询结果,搜索用时 15 毫秒
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This paper studies a robust continuous‐time Markowitz portfolio selection problem where the model uncertainty affects the covariance matrix of multiple risky assets. This problem is formulated into a min–max mean‐variance problem over a set of nondominated probability measures that is solved by a McKean–Vlasov dynamic programming approach, which allows us to characterize the solution in terms of a Bellman–Isaacs equation in the Wasserstein space of probability measures. We provide explicit solutions for the optimal robust portfolio strategies and illustrate our results in the case of uncertain volatilities and ambiguous correlation between two risky assets. We then derive the robust efficient frontier in closed form, and obtain a lower bound for the Sharpe ratio of any robust efficient portfolio strategy. Finally, we compare the performance of Sharpe ratios for a robust investor and for an investor with a misspecified model.  相似文献   
3.
Ozdemir  Ali Ihsan  Ar  Ilker Murat  Erol  Ismail 《Quality and Quantity》2020,54(5-6):1549-1563
Quality & Quantity - Blockchain technology (BCT) is a network-based system, which is developed to create secure, smart and transparent distributed ledgers. Recently, BCT has been gaining more...  相似文献   
4.
Aims: This study compared the risk for major bleeding (MB) and healthcare economic outcomes of patients with non-valvular atrial fibrillation (NVAF) after initiating treatment with apixaban vs rivaroxaban, dabigatran, or warfarin.

Methods: NVAF patients who initiated apixaban, rivaroxaban, dabigatran, or warfarin were identified from the IMS Pharmetrics Plus database (January 1, 2013–September 30, 2015). Propensity score matching (PSM) was used to balance differences in patient characteristics between study cohorts: patients treated with apixaban vs rivaroxaban, apixaban vs dabigatran, and apixaban vs warfarin. Risk of hospitalization and healthcare costs (all-cause and MB-related) were compared between matched cohorts during the follow-up.

Results: During the follow-up, risks for all-cause (hazard ratio [HR]?=?1.44, 95% confidence interval [CI]?=?1.2–1.7) and MB-related (HR?=?1.57, 95% CI?=?1.0–2.4) hospitalizations were significantly greater for patients treated with rivaroxaban vs apixaban. Adjusted total all-cause healthcare costs were significantly lower for patients treated with apixaban vs rivaroxaban ($3,950 vs $4,333 per patient per month [PPPM], p?=?.002) and MB-related medical costs were not statistically significantly different ($100 vs $233 PPPM, p?=?.096). Risk for all-cause hospitalization (HR?=?1.98, 95% CI?=?1.6–2.4) was significantly greater for patients treated with dabigatran vs apixaban, although total all-cause healthcare costs were not statistically different. Risks for all-cause (HR?=?2.22, 95% CI?=?1.9–2.5) and MB-related (HR?=?2.05, 95% CI?=?1.4–3.0) hospitalizations were significantly greater for patients treated with warfarin vs apixaban. Total all-cause healthcare costs ($3,919 vs $4,177 PPPM, p?=?.025) and MB-related medical costs ($96 vs $212 PPPM, p?=?.026) were significantly lower for patients treated with apixaban vs warfarin.

Limitations: This retrospective database analysis does not establish causation.

Conclusions: In the real-world setting, compared with rivaroxaban and warfarin, apixaban is associated with reduced risk of hospitalization and lower healthcare costs. Compared with dabigatran, apixaban is associated with lower risk of hospitalizations.  相似文献   
5.
Migration theory advances several reasons for migration, which can be categorised into two groups: push factors and pull factors. Push factors include the economic performance of the emigrating country, whereas the pull factors include performance in the destination country. The latter include gross domestic product, job creation, the unemployment rate, education level, and wage rate. This paper examines the determinants of immigration from the Association of Southeast Asian Nations (ASEAN)‐3, namely Indonesia, Thailand, and the Philippines, into Malaysia. The analysis is based on panel data of 1990–2008 using the Autoregressive Distributed Lag approach. The results show that the main determinants of this migration flow are the real wage ratio among the ASEAN‐3 and Malaysia, the unemployment rate in the source countries, and the real exchange rate ratio between the ASEAN‐3 and Malaysia.  相似文献   
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The objectives of this study are to test the relationship between tourism motivations and tourist satisfaction, and to test how ‘Religion’ moderates the relationship. The variable ‘Religion’ is represented by the availability of Islamic norms and practices relevant to tourism at the destination. The results of the partial least square indicate that tourism motivations are significantly and positively related to tourist satisfaction. The results also showed that Religion significantly moderates the relationship between pull motivation and tourist satisfaction. However, the moderating effect of Religion on the relationship between push motivation and tourist satisfaction was not supported.  相似文献   
8.
The purpose of this study is two folds: firstly, to analyze the direction of causality between corruption and political instability directly and secondly, to determine the causality between corruption and political instability indirectly through judicial inefficiency in Pakistan. The causality between corruption, political instability and judicial inefficiency is tested by applying Toda–Yamamoto Granger causality test. The results show that there is a lack of direct causal relationship between corruption and political instability. However, political instability and corruption cause each other indirectly through judicial inefficiency. The study highlights the critical role of judicial inefficiency leading to an important policy implication.  相似文献   
9.
With very few exceptions the accepted viewpoint established by (predominantly) US research is that bank operating performance is not improved after merger. In this article we concentrate on European banks and investigate post-merger operating performance for 35 publicly listed bank mergers that were completed between 1992 and 1997. We find that industry-adjusted mean cash flow return did not significantly change after merger but stayed positive. We also find that the merger led to a significant decrease in profitability and capitalisation. Our key finding, in contrast to the US evidence, is that cost-efficiency ratios improved, although the improvement was not large enough to offset the profitability decrease. We also find that low profitability levels, conservative credit policies and good cost-efficiency status before merger are the main determinants of industry-adjusted cash flow returns and provide the source for improving these returns after merger.  相似文献   
10.
This paper examines the performance of auditors in generating hypotheses in an analytical review case both prior to and after review. It partitions two possible sources of gain from the review process, namely the discussion effect and the rank effect. The discussion effect compares review groups with and without discussion. The rank effect compares seniors and audit managers. The study found that the review process results in more plausible hypotheses being generated. Discussion within the review process between reviewer and reviewee was found to be one source of gain from the review process. While there was no difference in the performance of the senior and manager reviewers, managers completed the task in less time.  相似文献   
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