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Dive into the research topics where Takaki Hayashi is active.

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Featured researches published by Takaki Hayashi.


Journal of Economic Interaction and Coordination | 2012

Comprehensive analysis of market conditions in the foreign exchange market

Akihiro Sato; Takaki Hayashi; Janusz A. Hołyst

We investigate quotation and transaction activities in the foreign exchange market for every week during the period of June 2007 to December 2010. A scaling relationship between the mean values of number of quotations (or number of transactions) for various currency pairs and the corresponding standard deviations holds for a majority of the weeks. However, the scaling breaks in some time intervals, which is related to the emergence of market shocks. There is a monotonous relationship between values of scaling indices and global averages of currency pair cross-correlations when both quantities are observed for various window lengths Δt.


Bernoulli | 2005

On covariance estimation of non-synchronously observed diffusion processes

Takaki Hayashi; Nakahiro Yoshida


Mathematical Finance | 2005

EVALUATING HEDGING ERRORS: AN ASYMPTOTIC APPROACH

Takaki Hayashi; Per A. Mykland


Annales De L Institut Henri Poincare-probabilites Et Statistiques | 2011

Irregular sampling and central limit theorems for power variations: The continuous case

Takaki Hayashi; Jean Jacod; Nakahiro Yoshida


Stochastic Processes and their Applications | 2011

Nonsynchronous covariation process and limit theorems

Takaki Hayashi; Nakahiro Yoshida


Annals of the Institute of Statistical Mathematics | 2008

Asymptotic normality of a covariance estimator for nonsynchronously observed diffusion processes

Takaki Hayashi; Nakahiro Yoshida


Archive | 2005

On covariance estimation of non-synchronously observed diffusion

Takaki Hayashi; Nakahiro Yoshida


Statistical Inference for Stochastic Processes | 2007

Consistent estimation of covariation under nonsynchronicity

Takaki Hayashi; Shigeo Kusuoka


Archive | 2008

Nonsynchronous covariance estimator and limit theorem II

Takaki Hayashi


Quantitative Finance | 2004

A duscrete-time model of high-frequency stock returns

Takaki Hayashi

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Janusz A. Hołyst

Warsaw University of Technology

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