title: The risks of trading on cryptocurrencies: A regime-switching approach based on volatility jumps and co-jumping behaviours

authors: Li, Leon

abstract: Previous research has shown volatility jumps and co-jumping behaviours in cryptocurrency markets. Motivated by these findings, we employ the herding effect and financial contagion channel to outline a theoretical framework of volatility-state-dependent correlations in cryptocurrency markets. We show that digital currency markets are more strongly correlated when experiencing an identical volatility regime, which echoes co-jumping behaviours addressed by the literature. Moreover, the strong correlation that occurs when the paired cryptocurrencies simultaneously experience a high volatility regime results in the least effectiveness of diversification in terms of a minimum portfolio risk reduction. Last but not least, the proposed state-dependent approach in this study proves effective at the task of risk forecasting and risk reduction for cryptocurrency portfolios, beyond the bivariate GARCH-based models, which are a pure and simple time-dependent approach.

text: The risks of trading on cryptocurrencies: A regime-switching approach based on volatility jumps and co-jumping behaviours Previous research has shown volatility jumps and co-jumping behaviours in cryptocurrency markets. Motivated by these findings, we employ the herding effect and financial contagion channel to outline a theoretical framework of volatility-state-dependent correlations in cryptocurrency markets. We show that digital currency markets are more strongly correlated when experiencing an identical volatility regime, which echoes co-jumping behaviours addressed by the literature. Moreover, the strong correlation that occurs when the paired cryptocurrencies simultaneously experience a high volatility regime results in the least effectiveness of diversification in terms of a minimum portfolio risk reduction. Last but not least, the proposed state-dependent approach in this study proves effective at the task of risk forecasting and risk reduction for cryptocurrency portfolios, beyond the bivariate GARCH-based models, which are a pure and simple time-dependent approach.

year: 2023-02-7

title: A weakly Stegall space that is not a Stegall space

authors: Moors, Warren B.

subjects: Weak Asplun

abstract: A topological space X is said to belong to the class of Stegall (weakly Stegall) spaces if for every Baire (complete metric) space B and minimal usco φ : B2X, φ is single-valued at some point of B. In this paper we show that under some additional set-theoretic assumptions that are equiconsistent with the existence of a measurable cardinal there is a Banach space X whose dual, equipped with the weak topology, is in the class of weakly Stegall spaces but not in the class of Stegall spaces. This paper also contains an example of a compact space K such that K belongs to the class of weakly Stegall spaces but ( C(K), weak) does not.

text: A weakly Stegall space that is not a Stegall space A topological space X is said to belong to the class of Stegall (weakly Stegall) spaces if for every Baire (complete metric) space B and minimal usco φ : B2X, φ is single-valued at some point of B. In this paper we show that under some additional set-theoretic assumptions that are equiconsistent with the existence of a measurable cardinal there is a Banach space X whose dual, equipped with the weak topology, is in the class of weakly Stegall spaces but not in the class of Stegall spaces. This paper also contains an example of a compact space K such that K belongs to the class of weakly Stegall spaces but ( C(K), weak) does not.

year: 2002-06

title: Dialogue as a method for evolving Mātauranga Māori: Perspectives on the use of embryos in research

authors: Hudson, Maui

subjects: New Zealand

abstract: This paper explores the epistemological divide between mātauranga Māori (Māori knowledge) and science, and considers which cultural concepts have relevance when considering the use of embryos in research. We argue that empowerment is a necessary precursor for a dialogue process to be effective and to maintain the cultural dignity and confidence of the participants. Negotiating spaces to share ideas, concepts and values between different knowledge systems is an important exercise that creates opportunities for innovative thinking. The identification of cultural cues and indigenous reference points for considering how knowledge relating to embryo research might be located within a traditional knowledge schema is a necessary type of activity to ensure mātauranga Māori maintains its usefulness for Māori in a changing society while retaining its indigenous spirit and cultural tradition.

text: Dialogue as a method for evolving Mātauranga Māori: Perspectives on the use of embryos in research This paper explores the epistemological divide between mātauranga Māori (Māori knowledge) and science, and considers which cultural concepts have relevance when considering the use of embryos in research. We argue that empowerment is a necessary precursor for a dialogue process to be effective and to maintain the cultural dignity and confidence of the participants. Negotiating spaces to share ideas, concepts and values between different knowledge systems is an important exercise that creates opportunities for innovative thinking. The identification of cultural cues and indigenous reference points for considering how knowledge relating to embryo research might be located within a traditional knowledge schema is a necessary type of activity to ensure mātauranga Māori maintains its usefulness for Māori in a changing society while retaining its indigenous spirit and cultural tradition.

year: 2010