Search Results for author: Kei Nakagawa

Found 17 papers, 2 papers with code

CFTM: Continuous time fractional topic model

no code implementations29 Jan 2024 Kei Nakagawa, Kohei Hayashi, Yugo Fujimoto

This approach incorporates fractional Brownian motion~(fBm) to effectively identify positive or negative correlations in topic and word distribution over time, revealing long-term dependency or roughness.

Dynamic Topic Modeling

Doubly Robust Mean-CVaR Portfolio

no code implementations20 Sep 2023 Kei Nakagawa, Masaya Abe, Seiichi Kuroki

However, the instability associated with the input parameter changes and estimation errors can deteriorate portfolio performance.

Portfolio Optimization

Schrödinger Risk Diversification Portfolio

no code implementations21 Feb 2022 Yusuke Uchiyama, Kei Nakagawa

However, since it is difficult to estimate the expected return and the out-of-sample performance of the mean-variance portfolio is poor, risk-based portfolio construction methods focusing only on risk have been proposed, and are attracting attention mainly in practice.

Dimensionality Reduction

Fractional SDE-Net: Generation of Time Series Data with Long-term Memory

no code implementations16 Jan 2022 Kohei Hayashi, Kei Nakagawa

It generalizes the neural stochastic differential equation model by using fractional Brownian motion with a Hurst index larger than half, which exhibits the LRD property.

Time Series Time Series Analysis

Improving Nonparametric Classification via Local Radial Regression with an Application to Stock Prediction

no code implementations28 Dec 2021 Ruixing Cao, Akifumi Okuno, Kei Nakagawa, Hidetoshi Shimodaira

For correcting the asymptotic bias with fewer observations, this paper proposes a \emph{local radial regression (LRR)} and its logistic regression variant called \emph{local radial logistic regression~(LRLR)}, by combining the advantages of LPoR and MS-$k$-NN.

regression Stock Prediction

No-Transaction Band Network: A Neural Network Architecture for Efficient Deep Hedging

2 code implementations2 Mar 2021 Shota Imaki, Kentaro Imajo, Katsuya Ito, Kentaro Minami, Kei Nakagawa

Deep hedging (Buehler et al. 2019) is a versatile framework to compute the optimal hedging strategy of derivatives in incomplete markets.

Controlling False Discovery Rates under Cross-Sectional Correlations

no code implementations15 Feb 2021 Junpei Komiyama, Masaya Abe, Kei Nakagawa, Kenichiro McAlinn

We achieve superior statistical power to existing methods and prove that the false discovery rate is controlled.

Time Series Time Series Analysis

Deep Portfolio Optimization via Distributional Prediction of Residual Factors

no code implementations14 Dec 2020 Kentaro Imajo, Kentaro Minami, Katsuya Ito, Kei Nakagawa

In this study, we propose a novel method of constructing a portfolio based on predicting the distribution of a financial quantity called residual factors, which is known to be generally useful for hedging the risk exposure to common market factors.

BIG-bench Machine Learning Portfolio Optimization

Mean-Variance Efficient Reinforcement Learning by Expected Quadratic Utility Maximization

no code implementations3 Oct 2020 Masahiro Kato, Kei Nakagawa, Kenshi Abe, Tetsuro Morimura

To achieve this purpose, we train an agent to maximize the expected quadratic utility function, a common objective of risk management in finance and economics.

Decision Making Decision Making Under Uncertainty +3

Policy Gradient with Expected Quadratic Utility Maximization: A New Mean-Variance Approach in Reinforcement Learning

no code implementations28 Sep 2020 Masahiro Kato, Kei Nakagawa

In this paper, we suggest expected quadratic utility maximization (EQUM) as a new framework for policy gradient style reinforcement learning (RL) algorithms with mean-variance control.

Decision Making Management +1

RM-CVaR: Regularized Multiple $β$-CVaR Portfolio

no code implementations28 Apr 2020 Kei Nakagawa, Shuhei Noma, Masaya Abe

In order to improve this problem, we propose RM-CVaR: Regularized Multiple $\beta$-CVaR Portfolio.

Portfolio Optimization

Cross-sectional Stock Price Prediction using Deep Learning for Actual Investment Management

no code implementations17 Feb 2020 Masaya Abe, Kei Nakagawa

We perform empirical analysis in the Japanese stock market and confirm the profitability of our framework.

Management Stock Price Prediction

TPLVM: Portfolio Construction by Student's $t$-process Latent Variable Model

no code implementations29 Jan 2020 Yusuke Uchiyama, Kei Nakagawa

By comparing these portfolios, we confirm the proposed portfolio outperforms that of the existing Gaussian process latent variable model.

A Robust Transferable Deep Learning Framework for Cross-sectional Investment Strategy

no code implementations2 Oct 2019 Kei Nakagawa, Masaya Abe, Junpei Komiyama

Stock return predictability is an important research theme as it reflects our economic and social organization, and significant efforts are made to explain the dynamism therein.

BIG-bench Machine Learning Decision Making +1

Deep Recurrent Factor Model: Interpretable Non-Linear and Time-Varying Multi-Factor Model

no code implementations20 Jan 2019 Kei Nakagawa, Tomoki Ito, Masaya Abe, Kiyoshi Izumi

Specifically, we extend the linear multi-factor model to be non-linear and time-varying with LSTM.

Management

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