scholarly journals LQ45 Stock Portfolio Selection using Black-Litterman Model in Pandemic Time Covid-19

2021 ◽  
Vol 5 (2) ◽  
pp. 343-354
Author(s):  
Siska Yosmar ◽  
S Damayanti ◽  
S Febrika
Keyword(s):  
Virus Infection ◽  
Portfolio Selection ◽  
Financial Institution ◽  
Virus Disease ◽  
Stock Index ◽  
Financial Assets ◽  
Investment Company ◽  
Expected Return ◽  
The World ◽  
Stock Portfolio

The world was shocked by the emergence of a virus that spread very quickly to several countries including Indonesia at the end of 2019. This virus infection is called Corona Virus Disease 2019 (Covid-19). The outbreak of Covid-19 not only threatens human lives but also disrupts various economic, financial, and business activities, especially in Indonesia. A stock portfolio is a collection of financial assets in a unit that is held or created by an investor, investment company, or financial institution. The Black-Litterman model of the stock portfolio is a portfolio model that involves the CAPM equilibrium return and investor views. The purpose of this study is to determine the stock portfolio with the Black-Litterman model using company data listed in the LQ45 stock index from January 2020 to June 2020. Four of the twenty-nine LQ45 stocks were selected as assets in the stock portfolio. The stock portfolio containing the four stocks, namely ICBP, KLBF, MNCN, and TLKM with the Black-Litterman model resulted in an expected return of 2.07% and a risk of 2.82%.

scholarly journals The Ability of Zika virus Intravenous Immunoglobulin to Protect From or Enhance Zika Virus Disease

2021 ◽  
Vol 12 ◽  
Author(s):  
Amelia K. Pinto ◽  
Mariah Hassert ◽  
Xiaobing Han ◽  
Douglas Barker ◽  
Trevor Carnelley ◽  
...  
Keyword(s):  
Virus Infection ◽  
Polyclonal Antibody ◽  
Zika Virus ◽  
Virus Disease ◽  
Polyclonal Antibodies ◽  
Antibody Therapeutics ◽  
The World ◽  
Flavivirus Infection

The closely related flaviviruses, dengue and Zika, cause significant human disease throughout the world. While cross-reactive antibodies have been demonstrated to have the capacity to potentiate disease or mediate protection during flavivirus infection, the mechanisms responsible for this dichotomy are still poorly understood. To understand how the human polyclonal antibody response can protect against, and potentiate the disease in the context of dengue and Zika virus infection we used intravenous hyperimmunoglobulin (IVIG) preparations in a mouse model of the disease. Three IVIGs (ZIKV-IG, Control-Ig and Gamunex®) were evaluated for their ability to neutralize and/or enhance Zika, dengue 2 and 3 viruses in vitro. The balance between virus neutralization and enhancement provided by the in vitro neutralization data was used to predict the IVIG concentrations which could protect or enhance Zika, and dengue 2 disease in vivo. Using this approach, we were able to define the unique in vivo dynamics of complex polyclonal antibodies, allowing for both enhancement and protection from flavivirus infection. Our results provide a novel understanding of how polyclonal antibodies interact with viruses with implications for the use of polyclonal antibody therapeutics and the development and evaluation of the next generation flavivirus vaccines.

scholarly journals Neurologic Manifestations of the World Health Organization's List of Pandemic and Epidemic Diseases

2021 ◽  
Vol 12 ◽  
Author(s):  
Caleb R. S. McEntire ◽  
Kun-Wei Song ◽  
Robert P. McInnis ◽  
John Y. Rhee ◽  
Michael Young ◽  
...  
Keyword(s):  
Virus Infection ◽  
Virus Disease ◽  
Case Reports ◽  
Hemorrhagic Fever ◽  
Hendra Virus ◽  
Marburg Virus ◽  
World Health ◽  
Neurological Manifestations ◽  
Valley Fever ◽  
The World

The World Health Organization (WHO) monitors the spread of diseases globally and maintains a list of diseases with epidemic or pandemic potential. Currently listed diseases include Chikungunya, cholera, Crimean-Congo hemorrhagic fever, Ebola virus disease, Hendra virus infection, influenza, Lassa fever, Marburg virus disease, Neisseria meningitis, MERS-CoV, monkeypox, Nipah virus infection, novel coronavirus (COVID-19), plague, Rift Valley fever, SARS, smallpox, tularemia, yellow fever, and Zika virus disease. The associated pathogens are increasingly important on the global stage. The majority of these diseases have neurological manifestations. Those with less frequent neurological manifestations may also have important consequences. This is highlighted now in particular through the ongoing COVID-19 pandemic and reinforces that pathogens with the potential to spread rapidly and widely, in spite of concerted global efforts, may affect the nervous system. We searched the scientific literature, dating from 1934 to August 2020, to compile data on the cause, epidemiology, clinical presentation, neuroimaging features, and treatment of each of the diseases of epidemic or pandemic potential as viewed through a neurologist's lens. We included articles with an abstract or full text in English in this topical and scoping review. Diseases with epidemic and pandemic potential can be spread directly from human to human, animal to human, via mosquitoes or other insects, or via environmental contamination. Manifestations include central neurologic conditions (meningitis, encephalitis, intraparenchymal hemorrhage, seizures), peripheral and cranial nerve syndromes (sensory neuropathy, sensorineural hearing loss, ophthalmoplegia), post-infectious syndromes (acute inflammatory polyneuropathy), and congenital syndromes (fetal microcephaly), among others. Some diseases have not been well-characterized from a neurological standpoint, but all have at least scattered case reports of neurological features. Some of the diseases have curative treatments available while in other cases, supportive care remains the only management option. Regardless of the pathogen, prompt, and aggressive measures to control the spread of these agents are the most important factors in lowering the overall morbidity and mortality they can cause.

scholarly journals Literature Review of Epidemiological Phenomena: Corona Virus Disease Pandemic 2019

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Yarmaliza Yarmaliza ◽  
Teungku Nih Farisni ◽  
Fitriani Fitriani ◽  
Zakiyuddin Zakiyuddin ◽  
Fitrah Reynaldi ◽  
...  
Keyword(s):  
Virus Infection ◽  
Severe Acute Respiratory Syndrome ◽  
Literature Review ◽  
Virus Disease ◽  
Wuhan City ◽  
Corona Virus ◽  
The World ◽  
History Of ◽  
New Type ◽  
The City

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) or Corona virus is a new type of coronavirus that is transmitted to humans. Corona virus infection called COVID-19 (Corona Virus Disease 2019) was first discovered in the city of Wuhan, China at the end of December 2019. Until March 2, 2020, more than 80 thousand confirmed cases have been reported in China. Of these cases, 49 thousand were identified in Wuhan City. Epidemiologically, the spread or distribution of this disease has a wide social and economic impact on the world. Many literature studies about the COVID-19 outbreak, such as causes, natural history of the disease, even to the preventive and medical treatment. Since the end of 2019 until April 2020, there have been many published literature or literature studies at both national and international levels, so this paper aims to examine literature studies related to COVID-19.

scholarly journals Risk-Return Analysis on Optimum Portfolio Selection of Islamic Stocks

2021 ◽  
Vol 9 (1) ◽  
pp. 65
Author(s):  
Siti Amaroh ◽  
Chanif Nasichah
Keyword(s):  
Stock Returns ◽  
Portfolio Selection ◽  
Excess Return ◽  
Expected Return ◽  
Portfolio Returns ◽  
Risk Return ◽  
Closing Price ◽  
Stock Portfolio ◽  
Portfolio Return ◽  
Selection Of

<p><em>This study aims to determine the optimum portfolio category and analyze the risk-return on a formed portfolio. Data was taken from eighteen listed companies indexed by Jakarta Islamic Index during 2015-2018. Stock returns are calculated based on the closing price at the end of each month in the period. Sharia Certificate of Bank Indonesia is a proxy of risk-free return, while the market return is measured by the value of the Jakarta Islamic Index. Stocks are sorted by the value of excess return to beta (ERB) from highest to lowest, and to obtain optimal stock portfolio candidates, and the ERB value must be compared with the cut-off rate value. Seven issuers qualify for forming the optimum portfolio of shares. The results show that the optimum portfolio return is greater than the expected return and the expected risk-free return. When compared between individual stock returns and portfolio stock returns, some individual stocks provide higher returns than portfolio returns. However, the risk of individual shares was also higher than the risk of the portfolio. This finding proves that risk can be reduced optimally in Islamic stocks selection by forming an optimum portfolio.</em></p>

scholarly journals Review Article: Laboratory Tests and Their Role for Detecting Covid 19 Infection

2021 ◽  
Vol 8 (2) ◽  
pp. 137-140
Author(s):  
Doaa Dawood Salman
Keyword(s):  
Virus Infection ◽  
Early Detection ◽  
Laboratory Tests ◽  
Virus Disease ◽  
Review Article ◽  
Disease Spread ◽  
Rapid Spread ◽  
The World ◽  
Time Accuracy ◽  
Test Result

Corona Virus Disease or what is known (Covid 19) is pandemic spread quickly among most countries of the world, where the infections reached to 50 million humans, and more than 1.250.000 deaths. The reasons of the disease spread among people are the infected and not taking adequate preventive procedures. The delay of the laboratory test result to confirm infection also contributes in the disease spread. Examples of the test are RT-RPC, which requires a lot of time, accuracy in the work, and high experience techniques. These conditions are not available in almost countries, which do this test for limited people with clear symptoms. In this research, some Laboratory tests are concerned to show their role in detecting the virus, where the result of this study show that the results of RT-RPC test are inaccurate by 20%, and so most of the countries that suffered from the rapid spread of the virus resorted to relying on other laboratory tests that less cost and give a quick results to early detection of the virus infection, and these tests can identify false results of RT-RPC.

COVID 19: REALS AND CHALLENGES AGAINST DOCTORS

2020 ◽  
Vol 2 (1) ◽  
pp. 65-87
Author(s):  
Zen Ahmad
Keyword(s):  
Virus Disease ◽  
Clinical Manifestations ◽  
World Health ◽  
Unknown Etiology ◽  
Wuhan City ◽  
Traditional Markets ◽  
Pneumonia Case ◽  
The World ◽  
New Type ◽  
Health Organization

Corona Virus Disease (Covid-19) is a contagious disease caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) which was discovered in December 2019 in China. This disease can cause clinical manifestations in the airway, lung and systemic. The World Health Organization (WHO) representative of China reported a pneumonia case with unknown etiology in Wuhan City, Hubei Province, China on December 31, 2019. The cause was identified as a new type of coronavirus on January 7, 2020 with an estimated source of the virus from traditional markets (seafood market). ) Wuhan city

ASPEK ETIK DAN SISTEMIK DALAM EKONOMI DAN BISNIS ISLAM

ALQALAM ◽  
2014 ◽  
Vol 31 (1) ◽  
pp. 187
Author(s):  
Budi Harsanto
Keyword(s):  
Financial Crisis ◽  
Business Ethics ◽  
Moral Hazard ◽  
Global Financial Crisis ◽  
Financial Institution ◽  
Research Question ◽  
Academic Journals ◽  
Lehman Brothers ◽  
The World ◽  
The Global Financial Crisis

The fall of Enron, Lehman Brothers and other major financial institution in the world make researchers conduct various studies about crisis. The research question in this study is, from Islamic economics and business standpoint, why the global financial crisis can happen repeatedly. The purpose is to contribute ideas regarding Islamic viewpoint linked with the global financial crisis. The methodology used is a theoretical-reflective to various article published in academic journals and other intellectual resources with relevant themes. There are lots of analyses on the causes of the crisis. For discussion purposes, the causes divide into two big parts namely ethics and systemic. Ethics contributed to the crisis by greed and moral hazard as a theme that almost always arises in the study of the global financial crisis. Systemic means that the crisis can only be overcome with a major restructuring of the system. Islamic perspective on these two aspect is diametrically different. At ethics side, there is exist direction to obtain blessing in economics and business activities. At systemic side, there is rule of halal and haram and a set of mechanism of economics system such as the concept of ownership that will early prevent the seeds of crisis. Keywords: Islamic economics and business, business ethics, financial crisis 

ANALISIS DIVERSIFIKASI INTERNASIONAL : PEMBENTUKAN PORTOFOLIO OPTIMAL INDEKS SAHAM DUNIA (Studi Kasus Pada Indeks Saham Aktif Dunia Versi The Wall Street Journal)

2019 ◽  
Vol 6 (02) ◽  
Author(s):  
Rony Mahendra ◽  
Erwin Dyah Astawinetu
Keyword(s):  
Wall Street Journal ◽  
Optimal Portfolio ◽  
Stock Index ◽  
Wall Street ◽  
Expected Return ◽  
Single Index ◽  
Index Model ◽  
Single Index Model ◽  
Stock Indices ◽  
The Wall Street Journal

The research objective is to establish an optimal portfolio and know the difference between risk and return stock index portfolio candidates and non-candidates. Method used in the preparation of this research portfolio is the single index model, while the samples of this study are active world stock indices version of The Wall Street Journal during the period August 2012 - August 2016 and The Global Dow is used as the benchmark stock index. In establishing the optimal portfolio is used two perspectives: the Rupiah perspective and the U.S. Dollar perspective. The results showed there were three stock indices from the perspective of Rupiah and 8 share index menurutperspektif U.S. Dollar that make up the optimal portfolio, with the cut-of-pointsebesar 0,01393menurut Rupiah perspective and the perspective of 0.0078 US Dollars Based on the perspective of return expectations Rupiah obtained by 0.0258 with a risk of 0.06512. Berdarkan perspective of US Dollars, obtained return expectations at 0.0154 with a risk of 0.0292. From the test results showed that the hypothesis, the return on both perspectives there are significant differences between the index of the candidate, with a non-candidate. Then the risk of stock index, among the candidates, with a non-candidate, the Rupiah perspective there is no difference, but in the perspective of US Dollars, there are significant differences.Keywords: Single Index Model, candidate portfolio, optimal portfolio, expected return, excess return to beta, cut-off-point

COVID-19: The Unprecedented Malady-A Holistic Review

Coronaviruses ◽  
2020 ◽  
Vol 01 ◽  
Author(s):  
Viney Chawla ◽  
Pooja A Chawla
Keyword(s):  
Virus Disease ◽  
Drug Repurposing ◽  
Signs And Symptoms ◽  
Effective Vaccine ◽  
Runny Nose ◽  
Difficult Time ◽  
Holistic Review ◽  
The World ◽  
Spanish Flu ◽  
Corona Viruses

Background: Corona virus disease (COVID-19) is spreading rapidly at an unprecedented scale across continents and has emerged as the single biggest risk the world has faced in modern times. Some scientists are comparing it to Spanish flu that created havoc around a century ago. The fear of death by COVID-19 looms large at the world today. The disease has reached devastating proportions since its first reports in December 2019. Doctors are having a difficult time dealing with this challenge and the microbiologists are having sleepless nights to bring about an effective vaccine for this disease. Methods: A number of research and review articles have been exhaustively reviewed. The collected data was meticulously analysed and documented. Conclusion: This paper reviews the different types of corona viruses, the structure of SARS-CoV-2 responsible for COVID19, its transmission, virulence. Further, the article discusses the diagnosis, signs and symptoms like fever, breathlessness, cough, potential loss of taste or smell, sneezing, runny nose, fatigue, headache, sore throat and different treatment approaches including drug repurposing being tried by doctors around the globe that may come handy in the management of disease symptoms. The article describes the use of remdesivir, ribavarin, lopinavir, favipiravir, hydoxychloroquine, chloroquine, tocilizumab among others in treating COVID-19.

scholarly journals A Markov-Switching VSTOXX Trading Algorithm for Enhancing EUR Stock Portfolio Performance

Mathematics ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1030
Author(s):  
Oscar V. De la Torre-Torres ◽  
Evaristo Galeana-Figueroa ◽  
José Álvarez-García
Keyword(s):  
Markov Switching ◽  
Stock Index ◽  
Portfolio Performance ◽  
Trading Costs ◽  
Weighting Method ◽  
Treasury Bills ◽  
Markov Switching Models ◽  
Switching Models ◽  
Asset Portfolio ◽  
Stock Portfolio

In the present paper, we test the benefit of using Markov-Switching models and volatility futures diversification in a Euro-based stock portfolio. With weekly data of the Eurostoxx 50 (ESTOXX50) stock index, we forecasted the smoothed regime-specific probabilities at T + 1 and used them as the weighting method of a diversified portfolio in ESTOXX50 and ESTOSS50 volatility index (VSTOXX) futures. With the estimated smoothed probabilities from 9 July 2009 to 29 September 2020, we simulated the performance of three theoretical investors who paid different trading costs and invested in ESTOXX50 during calm periods (low volatility regime) or VSTOXX futures and the three-month German treasury bills in distressed or highly distressed periods (high and extreme volatility regimes). Our results suggest that diversification benefits hold in the short-term, but if a given investor manages a two-asset portfolio with ESTOXX50 and our simulated portfolios, the stock portfolio’s performance is enhanced significantly, in the long term, with the presence of trading costs. These results are of use to practitioners for algorithmic and active trading applications in ESTOXX50 ETFs and VSTOXX futures.

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