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  • 1
    UID:
    edochu_18452_29345
    Format: 1 Online-Ressource (30 Seiten)
    Content: COVID-19 has severely affected almost every aspect of our everyday lives, especially the use of open greenspace (OGS) in urban settings, which has proven to have a significant role in increasing overall public health and well-being. Hence, the restricted usage of these spaces should be reconsidered. This research aims to analyze the sensitive nature of OGS usage (1) during the pandemic from the perspective of users’ perceived safety and (2) after the pandemic to assess the possible long-term effects. Additionally, this research proposed that location-tracking mobile applications could lead to an increased frequency of OGS visits. The methodology contains detailed background research and two surveys. One survey was conducted during the pandemic in 2020 (sample size n = 412) and was repeated post-pandemic in 2024 (sample n = 451). The 2020 questionnaire A includes questions about the duration, frequency, and activities of OGS usage while focusing on the perceived safety and possibilities of monitoring OGS visits using mobile apps. The 2024 survey represents the continuation of the 2020 survey, focusing on the post-pandemic state of OGS. The statistical analysis is separated into a descriptive data analysis, various χ2 independence tests and a machine learning safety prediction. The results indicate how COVID-19 could affect OGS usage and how app-related physical safety enhancements during the pandemic cannot be statistically distinguished from those in the post-pandemic period. Although the interest in location-tracking mobile applications has statistically decreased in 2024, the majority of the total 863 participants stated that applications could increase their feeling of perceived safety. The added value of this research is that it considers age and gender roles in analyzing OGS usage in the context of a pandemic.
    Content: Peer Reviewed
    In: Basel : MDPI, 16,8
    Language: English
    URL: Volltext  (kostenfrei)
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  • 2
    UID:
    edochu_18452_22245
    Format: 1 Online-Ressource (57 Seiten)
    Content: Simulierte Hedge Missspezifikation zu Risikomanagementzwecken von Cryptocurrencies.
    Content: The market for cryptocurrencies is a very dynamic market with highly volatile movements and discontinuities from large jumps. We investigate the risk-management perspective when selling securities written on cryptocurrencies. To this day, options written on cryptocurrencies are not officially exchange-traded. This study mimics the dynamics of cryptocurrency markets in a simulation study. We assume that the asset follows the stochastic volatility with correlated jumps model as presented in Duffie et al. ( 2000 ) and price options with parameters calibrated on the CRIX, a cryptocurrency index that serves as a representative of market movements. We investigate on risk- management opportunities of hedging options written on cryptocurrencies and evaluate the hedge performance under model misspecification. The hedge models are misspecified in the manner that they include fewer sources of randomness than the nother the ment the ment the industry-standard Black-Scholes option pricing model, the Heston Stochastic volatility model, and the Merton jump-diffusion model. We present different hedging strategies and perform an empirical study on delta-hedging. We report poor hedging results when calibration is poor. The results show good performances of the Black-Scholes and the Heston model and outline the poor hedging performance of the Merton model. Lastly, we observe large unhedgeable losses in the left tail. These losses potentially result from large jumps.
    Note: Masterarbeit Humboldt-Universität zu Berlin 2019
    Language: English
    URL: Volltext  (kostenfrei)
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  • 3
    Online Resource
    Online Resource
    Berlin : Humboldt-Universität zu Berlin
    UID:
    edochu_18452_29120
    Format: 1 Online-Ressource (43 Seiten)
    Content: The cryptocurrency market is volatile, non-stationary and non-continuous. Together with liquid derivatives markets, this poses a unique opportunity to study risk management, especially the hedging of options, in a turbulent market. We study the hedge behaviour and effectiveness for the class of affine jump diffusion models and infinite activity Lévy processes. First, market data is calibrated to stochastic volatility inspired-implied volatility surfaces to price options. To cover a wide range of market dynamics, we generate Monte Carlo price paths using an stochastic volatility with correlated jumps model, a close-to-actual-market GARCH-filtered kernel density estimation as well as a historical backtest. In all three settings, options are dynamically hedged with Delta, Delta–Gamma, Delta–Vega and Minimum Variance strategies. Including a wide range of market models allows to understand the trade-off in the hedge performance between complete, but overly parsimonious models, and more complex, but incomplete models. The calibration results reveal a strong indication for stochastic volatility, low jump frequency and evidence of infinite activity. Short-dated options are less sensitive to volatility or Gamma hedges. For longer-dated options, tail risk is consistently reduced by multiple-instrument hedges, in particular by employing complete market models with stochastic volatility.
    Content: Peer Reviewed
    In: Dordrecht [u.a.] : Springer Science + Business Media B.V, 26,1, Seiten 91-133
    Language: English
    URL: Volltext  (kostenfrei)
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  • 4
    UID:
    almafu_BV010587824
    Format: 185 S. : Ill., graph. Darst.
    ISBN: 86-7979-012-5
    Series Statement: Biblioteka Kazaljka 1
    Language: Croatian
    Keywords: Wahlkampf ; Fernsehen
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