Search Results for author: Wolfgang Karl Härdle

Found 34 papers, 7 papers with code

Emoji Driven Crypto Assets Market Reactions

no code implementations16 Feb 2024 Xiaorui Zuo, Yao-Tsung Chen, Wolfgang Karl Härdle

In the burgeoning realm of cryptocurrency, social media platforms like Twitter have become pivotal in influencing market trends and investor sentiments.

Multimodal Sentiment Analysis

Robustifying Markowitz

no code implementations28 Dec 2022 Wolfgang Karl Härdle, Yegor Klochkov, Alla Petukhina, Nikita Zhivotovskiy

Markowitz mean-variance portfolios with sample mean and covariance as input parameters feature numerous issues in practice.

Time Series Time Series Analysis

Shapley Curves: A Smoothing Perspective

no code implementations23 Nov 2022 Ratmir Miftachov, Georg Keilbar, Wolfgang Karl Härdle

This paper fills the limited statistical understanding of Shapley values as a variable importance measure from a nonparametric (or smoothing) perspective.

A Data-driven Case-based Reasoning in Bankruptcy Prediction

no code implementations2 Nov 2022 Wei Li, Wolfgang Karl Härdle, Stefan Lessmann

In addition, we delicately examine the explainability of the CBR system in the decision-making process of bankruptcy prediction.

Decision Making

Risk budget portfolios with convex Non-negative Matrix Factorization

1 code implementation6 Apr 2022 Bruno Spilak, Wolfgang Karl Härdle

We propose a portfolio allocation method based on risk factor budgeting using convex Nonnegative Matrix Factorization (NMF).

Hedging Cryptocurrency Options

1 code implementation23 Nov 2021 Jovanka Lili Matic, Natalie Packham, Wolfgang Karl Härdle

We study the hedge behaviour and effectiveness for the class of affine jump diffusion models and infinite activity Levy processes.

Density Estimation Management

Understanding jumps in high frequency digital asset markets

1 code implementation18 Oct 2021 Danial Saef, Odett Nagy, Sergej Sizov, Wolfgang Karl Härdle

While attention is a predictor for digital asset prices, and jumps in Bitcoin prices are well-known, we know little about its alternatives.

Vocal Bursts Intensity Prediction

Cooling Measures and Housing Wealth: Evidence from Singapore

no code implementations26 Aug 2021 Wolfgang Karl Härdle, Rainer Schulz, Taojun Sie

Excessive house price growth was at the heart of the financial crisis in 2007/08.

A Time-Varying Network for Cryptocurrencies

no code implementations26 Aug 2021 Li Guo, Wolfgang Karl Härdle, Yubo Tao

To investigate these effects, we build a time-varying network for cryptocurrencies, based on the evolution of return cross-predictability and technological similarities.

Clustering

Networks of News and Cross-Sectional Returns

no code implementations12 Aug 2021 Junjie Hu, Wolfgang Karl Härdle

We uncover networks from news articles to study cross-sectional stock returns.

Cryptocurrency Dynamics: Rodeo or Ascot?

no code implementations23 Mar 2021 Konstantin Häusler, Wolfgang Karl Härdle

We model the dynamics of the cryptocurrency (CC) asset class via a stochastic volatility with correlated jumps (SVCJ) model with rolling-window parameter estimates.

Clustering Time Series +1

K-expectiles clustering

no code implementations16 Mar 2021 Bingling Wang, Yinxing Li, Wolfgang Karl Härdle

compared to other center based clustering methods, the adaptive $\tau$ cluster centers of pixel data can better capture and describe the features of an image.

Clustering Computational Efficiency +2

Understanding Smart Contracts: Hype or Hope?

1 code implementation15 Mar 2021 Elizaveta Zinovyeva, Raphael C. G. Reule, Wolfgang Karl Härdle

Smart Contracts are commonly considered to be an important component or even a key to many business solutions in an immense variety of sectors and promises to securely increase their individual efficiency in an ever more digitized environment.

FRM Financial Risk Meter for Emerging Markets

no code implementations10 Feb 2021 Souhir Ben Amor, Michael Althof, Wolfgang Karl Härdle

The FRM-EM is applied to capture systemic risk behavior embedded in the returns of the 25 largest EMs FIs, covering the BRIMST (Brazil, Russia, India, Mexico, South Africa, and Turkey), and thereby reflects the financial linkages between these economies.

Portfolio Optimization

Surrogate Models for Optimization of Dynamical Systems

1 code implementation22 Jan 2021 Kainat Khowaja, Mykhaylo Shcherbatyy, Wolfgang Karl Härdle

Driven by increased complexity of dynamical systems, the solution of system of differential equations through numerical simulation in optimization problems has become computationally expensive.

Tail-risk protection: Machine Learning meets modern Econometrics

1 code implementation7 Oct 2020 Bruno Spilak, Wolfgang Karl Härdle

Tail risk protection is in the focus of the financial industry and requires solid mathematical and statistical tools, especially when a trading strategy is derived.

BIG-bench Machine Learning Econometrics

An AI approach to measuring financial risk

no code implementations28 Sep 2020 Lining Yu, Wolfgang Karl Härdle, Lukas Borke, Thijs Benschop

AI artificial intelligence brings about new quantitative techniques to assess the state of an economy.

lCARE -- localizing Conditional AutoRegressive Expectiles

no code implementations28 Sep 2020 Xiu Xu, Andrija Mihoci, Wolfgang Karl Härdle

We account for time-varying parameters in the conditional expectile-based value at risk (EVaR) model.

A first econometric analysis of the CRIX family

no code implementations25 Sep 2020 Shi Chen, Cathy Yi-Hsuan Chen, Wolfgang Karl Härdle

Here we provide a first econometric analysis of the CRIX family within a time-series framework.

Clustering Model Selection +2

Copula-Based Factor Model for Credit Risk Analysis

no code implementations25 Sep 2020 Meng-Jou Lu, Cathy Yi-Hsuan Chen, Wolfgang Karl Härdle

A standard quantitative method to access credit risk employs a factor model based on joint multivariate normal distribution properties.

A Machine Learning Based Regulatory Risk Index for Cryptocurrencies

no code implementations25 Sep 2020 Xinwen Ni, Wolfgang Karl Härdle, Taojun Xie

The movements for both the VCRIX, a market volatility index, and the CRRIX are synchronous, meaning that the CRRIX could be helpful for all participants in the cryptocurrency market.

BIG-bench Machine Learning

A note on the impact of news on US household inflation expectations

no code implementations24 Sep 2020 Ben Zhe Wang, Jeffrey Sheen, Stefan Trück, Shih-Kang Chao, Wolfgang Karl Härdle

Monthly disaggregated US data from 1978 to 2016 reveals that exposure to news on inflation and monetary policy helps to explain inflation expectations.

Pricing Cryptocurrency Options

no code implementations23 Sep 2020 Ai Jun Hou, Weining Wang, Cathy Y. H. Chen, Wolfgang Karl Härdle

We show how the proposed pricing mechanism underlines the importance of jumps in cryptocurrency markets.

Distillation of News Flow into Analysis of Stock Reactions

no code implementations22 Sep 2020 Junni L. Zhang, Wolfgang Karl Härdle, Cathy Y. Chen, Elisabeth Bommes

We find there is significant incremental information in the distilled news flow and the sentiment effect is characterized as an asymmetric, attention-specific and sector-specific response of stock reactions.

CRIX an index for cryptocurrencies

no code implementations21 Sep 2020 Simon Trimborn, Wolfgang Karl Härdle

A method relying on the AIC is proposed to quickly react to market changes and therefore enable us to create an index, referred to as CRIX, for the cryptocurrency market.

Model Selection

Implied Basket Correlation Dynamics

no code implementations21 Sep 2020 Wolfgang Karl Härdle, Elena Silyakova

The IC surface (ICS) is then approximated from the implied volatilities of stocks and the implied volatility of the basket.

Regularization Approach for Network Modeling of German Power Derivative Market

no code implementations21 Sep 2020 Shi Chen, Wolfgang Karl Härdle, Brenda López Cabrera

The network analysis of the full German power derivative market helps us to complement a full picture of system risk, and have a better understanding of the German power market functioning and environment.

Variable Selection

Model-driven statistical arbitrage on LETF option markets

no code implementations21 Sep 2020 Sergey Nasekin, Wolfgang Karl Härdle

Extensive econometric analysis of LETF implied volatility process is performed including out-of-sample forecasting based on a semiparametric factor model and uniform confidence bands' study.

Data driven value-at-risk forecasting using a SVR-GARCH-KDE hybrid

no code implementations15 Sep 2020 Marius Lux, Wolfgang Karl Härdle, Stefan Lessmann

The SVR-GARCH-KDE hybrid is compared to standard, exponential and threshold GARCH models coupled with different error distributions.

Density Estimation Management

Rise of the Machines? Intraday High-Frequency Trading Patterns of Cryptocurrencies

1 code implementation9 Sep 2020 Alla A. Petukhina, Raphael C. G. Reule, Wolfgang Karl Härdle

This research analyses high-frequency data of the cryptocurrency market in regards to intraday trading patterns related to algorithmic trading and its impact on the European cryptocurrency market.

Algorithmic Trading Vocal Bursts Intensity Prediction

Investing with Cryptocurrencies -- evaluating their potential for portfolio allocation strategies

no code implementations9 Sep 2020 Alla Petukhina, Simon Trimborn, Wolfgang Karl Härdle, Hermann Elendner

Despite striking price volatility, their high average returns have drawn attention to CCs as alternative investment assets for portfolio and risk management.

Management

Editorial: Understanding Cryptocurrencies

no code implementations29 Jul 2020 Wolfgang Karl Härdle, Campbell R. Harvey, Raphael C. G. Reule

Cryptocurrency refers to a type of digital asset that uses distributed ledger, or blockchain, technology to enable a secure transaction.

Risk of Bitcoin Market: Volatility, Jumps, and Forecasts

no code implementations11 Dec 2019 Junjie Hu, Wolfgang Karl Härdle, Weiyu Kuo

Cryptocurrency, the most controversial and simultaneously the most interesting asset, has attracted many investors and speculators in recent years.

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