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  1. Article ; Online: Information Flow from COVID-19 Pandemic to Islamic and Conventional Equities

    Ahmed Bossman

    Complexity, Vol

    An ICEEMDAN-Induced Transfer Entropy Analysis

    2021  Volume 2021

    Abstract: With the steady growth in the data set on the COVID-19 pandemic, empirical works that employ novel and yet appropriate statistical techniques to corroborate previous findings of the pandemic and its consequences on financial markets are necessary. This ... ...

    Abstract With the steady growth in the data set on the COVID-19 pandemic, empirical works that employ novel and yet appropriate statistical techniques to corroborate previous findings of the pandemic and its consequences on financial markets are necessary. This paper examined the impact of COVID-19 information flow on the Islamic and conventional equities within the short-, mid-, and long-term horizons to assess possible diversification prospects in the era of the pandemic. To the studied equities markets, a novel technique based on a denoised frequency-domain entropy paradigm was applied. The operability of entrenched market dynamics in the long-term horizon of the COVID-19 pandemic period is reinforced by the results. The findings divulge diversification opportunities between Islamic and conventional equities in the short- and mid-term periods of the COVID-19 pandemic. The risks on equities from Japan or Bahrain could be diversified by equities from Jordan in the short-term, while in the intermediate-term stocks from Japan could diversify with the UAE and USA equities. The results imply that it is imperative for investors and fund managers to employ portfolio management techniques that show how to use benefits together with risk prevention and management across distinct time scales.
    Keywords Electronic computers. Computer science ; QA75.5-76.95
    Subject code 332
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Hindawi-Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Asymmetric impacts of geopolitical risk on stock markets

    Ahmed Bossman / Mariya Gubareva

    Heliyon, Vol 9, Iss 2, Pp e13626- (2023)

    A comparative analysis of the E7 and G7 equities during the Russian-Ukrainian conflict

    2023  

    Abstract: In a nonparametric quantile-on-quantile regression model, we analyze the asymmetric financial impact of the Russian-Ukrainian conflict-induced geopolitical risk (GPR) on the top-seven emerging (E7) and developed (G7) stock markets. Our findings indicate ... ...

    Abstract In a nonparametric quantile-on-quantile regression model, we analyze the asymmetric financial impact of the Russian-Ukrainian conflict-induced geopolitical risk (GPR) on the top-seven emerging (E7) and developed (G7) stock markets. Our findings indicate that the impact of GPR on stock markets is not only market-specific but also asymmetric. Except for Russia and China, all E7 and G7 stocks respond positively to GPR in normal conditions. Among the E7 (G7) countries, stock markets from Brazil, China, Russia, and Turkey (France, Japan, and the US) are resilient to GPR in bearish stages. The portfolio and policy implications of our findings have been highlighted.
    Keywords Geopolitical risk ; Russian-Ukrainian conflict ; E7 stock markets ; G7 stock markets ; Quantile-on-quantile regression ; Emerging stock markets ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Subject code 332
    Language English
    Publishing date 2023-02-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Technology and instructor dimensions, e-learning satisfaction, and academic performance of distance students in Ghana

    Ahmed Bossman / Samuel Kwaku Agyei

    Heliyon, Vol 8, Iss 4, Pp e09200- (2022)

    2022  

    Abstract: E-learning is soon expected to be widely used as a teaching and learning method in the mainstream for educational institutions. Given the relative preparedness of advanced economies, the conclusions about their implementation level with e-learning are ... ...

    Abstract E-learning is soon expected to be widely used as a teaching and learning method in the mainstream for educational institutions. Given the relative preparedness of advanced economies, the conclusions about their implementation level with e-learning are incomparable with emerging countries. Emerging economies must, therefore, be aware of the issues to consider when formulating successful adoption or implementation strategies. However, empirical studies that bring forth these relevant factors are out of context. In a single framework, we model the structural relationships between the drivers of e-learning satisfaction and the performance of distance learning students in a frontier economy, Ghana. With 388 validated responses gathered from an online survey across the country between 29 May 2021 and 25 June 2021, we employ the Smart-PLS estimator to process and analyse the data. We explicate that the substantial drivers of e-learning satisfaction and performance among distance learning students include technology anxiety, instructor factors, course quality, technology quality, and ease of use. Our findings divulge that perceived learner satisfaction mediates the relationships between the drivers of satisfaction and learning outcomes of distance learning students in Ghana such that technology anxiety and instructor factors would not essentially enhance learner performance in the absence of e-learning satisfaction. Consequently, system quality, reflected by the information system success model must be supplemented by satisfaction, drawn from the expectation-confirmation theory, to fully explain the impact of efficient e-learning systems on learning outcomes. Not only does ease of use create satisfaction, but it also boosts performance. We, therefore, recommend institutions to develop regular training for both facilitators and students and also adopt user-friendly online platforms to aid patronage by learners.
    Keywords Distance education system ; Instructor factors ; Technology anxiety ; e-learning satisfaction ; Learning outcomes ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Subject code 370
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Information flow between global financial market stress and African equity markets

    Mohammed Armah / Ahmed Bossman / Godfred Amewu

    Heliyon, Vol 9, Iss 3, Pp e13899- (2023)

    An EEMD-based transfer entropy analysis

    2023  

    Abstract: The flow of information between markets is important to guide investors and policymakers in the effective allocation of assets and proactive market regulation, respectively. This study examines the impact of information flow from global financial market ... ...

    Abstract The flow of information between markets is important to guide investors and policymakers in the effective allocation of assets and proactive market regulation, respectively. This study examines the impact of information flow from global financial market stress on the African stock markets using the daily US financial stress index (USFSI) and other advanced economies' financial stress index (OAEFSI) to proxy the global financial stress index. To understand the information flow dynamics across various investment horizons, the ensemble empirical mode decomposition (EEMD)-based transfer entropy is employed. Our findings reveal that African equity markets are highly risky for information flow from global financial market stress. However, we identify diversification prospects based on market conditions for Ghana and Egypt in the short term and Tanzania, Cote D'Ivoire, and Egypt in the medium term. Empirical results also show that the information flow from global financial stress to African stock markets depends on time scales, economic relations, and the state of global financial markets. The findings are important for investors, portfolio managers, practitioners, and policymakers.
    Keywords C58 ; D8 ; F36 ; G15 ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Subject code 332
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Information flow dynamics between geopolitical risk and major asset returns.

    Zaghum Umar / Ahmed Bossman / Sun-Yong Choi / Xuan Vinh Vo

    PLoS ONE, Vol 18, Iss 4, p e

    2023  Volume 0284811

    Abstract: We quantify information flows between geopolitical risk (GPR) and global financial assets such as equity, bonds, and commodities, with a focus on the Russian-Ukrainian conflict. We combine transfer entropy and the I-CEEMDAN framework to measure ... ...

    Abstract We quantify information flows between geopolitical risk (GPR) and global financial assets such as equity, bonds, and commodities, with a focus on the Russian-Ukrainian conflict. We combine transfer entropy and the I-CEEMDAN framework to measure information flows at multi-term scales. Our empirical results indicate that (i) in the short term, crude oil and Russian equity show opposite responses to GPR; (ii) in the medium and long term, GPR information increases the risk in the financial market; and (iii) the efficiency of the financial asset markets can be confirmed on a long-term scale. These findings have important implications for market participants, such as investors, portfolio managers, and policymakers.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Correction

    Zaghum Umar / Ahmed Bossman / Sun-Yong Choi / Xuan Vinh Vo

    PLoS ONE, Vol 18, Iss 11, p e

    Information flow dynamics between geopolitical risk and major asset returns.

    2023  Volume 0294959

    Abstract: This corrects the article DOI:10.1371/journal.pone.0284811.]. ...

    Abstract [This corrects the article DOI:10.1371/journal.pone.0284811.].
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Dynamic connectedness and spillovers between Islamic and conventional stock markets

    Ahmed Bossman / Peterson Owusu Junior / Aviral Kumar Tiwari

    Heliyon, Vol 8, Iss 4, Pp e09215- (2022)

    time- and frequency-domain approach in COVID-19 era

    2022  

    Abstract: This study investigates the dynamic connectedness and spillovers between Islamic and conventional stock markets to reveal the time- and frequency-domain dynamics of the two asset classes under various market conditions. Using the spillover index of ... ...

    Abstract This study investigates the dynamic connectedness and spillovers between Islamic and conventional stock markets to reveal the time- and frequency-domain dynamics of the two asset classes under various market conditions. Using the spillover index of Baruník and Křehlík (2018), supplemented by the time-varying parameter vector autoregressions (TVP-VAR) connectedness model, we employ daily stock market indices for Islamic and conventional (G7) markets from November 23, 2015, to September 8, 2021. The findings explicate that the volatility spillovers across and within Islamic and/or G7 markets are time-varying and frequency-dependent but during market turbulences, the conventional stocks are prone to more volatilities than the Islamic stocks. Our findings additionally divulge contagious spillovers among Islamic and conventional stocks during Brexit and the studied COVID-19 period. Relative to mid-and long-term spillovers, we underscore the supremacy of short-term spillovers between Islamic and G7 markets. In turbulent trading periods, investors should utilise knowledge about market patterns and volatility to hedge their positions against lower stock returns, when spillover is more intense. Regulators should pay close attention to spillovers since they undermine cross-market connections. Intriguing findings and their implications are further discussed.
    Keywords Dynamic connectedness ; Volatility spillovers ; Conventional stock markets ; Islamic stock markets ; Time- and frequency-domain ; COVID-19 pandemic ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Subject code 332
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Time-Frequency Analysis of COVID-19 Shocks and Energy Commodities

    Samuel Kwaku Agyei / Ahmed Bossman / Joseph Kofi Obeng Benchie / Oliver Asiamah / Emmanuel Yaw Arhin

    Complexity, Vol

    2023  Volume 2023

    Abstract: In a time-frequency biwavelet framework, we analysed the short-, medium-, and long-term impacts of COVID-19-related shocks on ten energy commodities (i.e., Brent, crude oil, coal, heating oil, natural gas, gasoline, ethanol, naphtha, propane, and uranium) ...

    Abstract In a time-frequency biwavelet framework, we analysed the short-, medium-, and long-term impacts of COVID-19-related shocks on ten energy commodities (i.e., Brent, crude oil, coal, heating oil, natural gas, gasoline, ethanol, naphtha, propane, and uranium) from January 2020 to April 2022. We document intervals of high and low coherence between COVID-19 cases and the returns on energy commodities across the short-, medium-, and long-term horizons. Low coherence at high frequencies indicated weak correlation and signified diversification, hedging, and safe-haven potentials in the short term of the pandemic. Our findings suggest that energy markets’ dynamics were highly driven by the pandemic, causing significant changes in market returns, particularly across the medium- and low-frequency bands. Furthermore, the empirical results indicate dynamic lead-lag relationships between COVID-19 cases and energy returns between the medium- and long-term horizons, signifying that diversification could be sought through crossinvestment in different energy commodities. The results have significant implications for market participants, regulators, and practitioners.
    Keywords Electronic computers. Computer science ; QA75.5-76.95
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher Hindawi-Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Effect of supplier appraisal on firm performance in Ghana

    Maame Boadiwaa Armoh / Paul Mensah Agyei / Ahmed Bossman / Eric Gonu / Mary Asare-Larbi

    Scientific African, Vol 21, Iss , Pp e01829- (2023)

    Views of employees of selected manufacturing firms

    2023  

    Abstract: In Ghana, recent financial sector clean-ups and reforms have impacted the operations of several corporations in the business-to-business market. Coupled with this, several issues have been reported concerning procurement practises in the past few years. ... ...

    Abstract In Ghana, recent financial sector clean-ups and reforms have impacted the operations of several corporations in the business-to-business market. Coupled with this, several issues have been reported concerning procurement practises in the past few years. Regardless of corporate governance practises and public procurement regulations, institutions in Ghana are yet to fully realise the relevance of supplier appraisal. Grounded by the resource base theory, the study examines the effect of appraisal of suppliers’ financial stability, technical capacity to produce, adherence to systems and procedures, conformance to legislation, and suppliers’ supply chain on the performance of industrial firms in Ghana. A sample of 171 employees was drawn from a total of 250 employees. Data processing and analysis were undertaken through the partial least squares structural equation modelling (PLS-SEM) estimator. The results clearly suggest that firms’ technical capacity does not constitute firm resources that translate to firm performance. However, firms’ financial stability, adherence to systems, conformance to legislation, and supply chains are regarded as firm resources that contribute to the overall performance of the firm. We conclude that supplier evaluation is a significant predictor of manufacturing firms’ performance.
    Keywords Supplier appraisal techniques ; Manufacturing firms ; Firm performance ; Science ; Q
    Subject code 650
    Language English
    Publishing date 2023-09-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Time-frequency connectedness between food commodities

    Peterson Owusu Junior / Samuel Kwaku Agyei / Anokye Mohammed Adam / Ahmed Bossman

    Environmental Challenges, Vol 9, Iss , Pp 100623- (2022)

    New implications for portfolio diversification

    2022  

    Abstract: This study examines the time-frequency connectedness of food commodities (cereals, dairy, food, meat, vegetable oil, and sugar) in the Food and Agriculture Organization's world food indices. With a monthly-frequency dataset covering February 1990 to ... ...

    Abstract This study examines the time-frequency connectedness of food commodities (cereals, dairy, food, meat, vegetable oil, and sugar) in the Food and Agriculture Organization's world food indices. With a monthly-frequency dataset covering February 1990 to October 2021, we utilise the returns spillover index approach of Baruník and Křehlík (2018). The results are robust to the time-varying parameter vector autoregressive (TVP-VAR) connectedness approach. The findings explicate that food commodities are highly connected in the short- and long-term horizons. The dynamic total connectedness varies from 15% to 80% in the short term, 1% to 70%, in the medium-term, and 1% to 75% in the long-term, with high fluctuations in notable crisis periods. Contagious returns spillovers between food commodities are propagated by vegetable oil. Diversification and safe-haven properties of food commodities are consistently found in the meat market across tranquil and exuberant trading periods, respectively. The safe-haven role of sugar in recent episodes of financial crises is highlighted by our findings. The economic, policy, and portfolio implications of our results are discussed.
    Keywords C58 ; G01 ; L66 ; Q02 ; Q18 ; Environmental sciences ; GE1-350
    Subject code 330
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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