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한국 원화 환율의 점프 변동성과 점프 발생 확률에 대한 비모수적 추정

Nonparametric Estimation of the Jump Volatility and Jump Probability of Exchange Rate of Korean Won

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참고문헌

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주제분류경제학

초록

본 연구는 최근 2003년~2010년 동안의 한국 원화의 대 미국 달러 환율의 변동성을 분석하기 위하여 세계적으로 볼 때도 극히 최근에 연구되기 시작한 비모수적 실현 변동성 파워이론을 도입하여, 5분간의 고빈도 자료들인 581,400개 관측치를 사용하여 원화 환율의 연속적 변동성과 불연속적인 점프 변동성과 점프발생 확률에 대한 비모수적 추정과 실증분석을 하였다. 본 연구결과 실현 변동성은 미국의 서브프라임 모기지 문제가 발생하였던 2006년과 2007년 아주 크게 나타났으며 세계금융위기가 있었던 2009년 전후로 아주 크게 나타났다가, 그 후 2009년을 지나면서 서서히 대미 달러 원화 환율의 변동성의 폭이 감소하였다. 수익률의 변동성은 2004년 초중반에 큰 변동성 점프가 발생하였고 또한 2006년과 2008년 사이에 유의적인 작은 점프가 빈번하게 나타났으며, 세계의 금융위기가 발생하였던 2009년 전후에는 원화 환율 수익률의 불연속적인 변동성 점프가 매우 크게 그리고 자주 발생하였고 그 후 2010년까지도 크고 작은 불규칙한 점프가 발생하였다. 그리하여 2003년부터 2010년까지 한국 원화의 대 미국 달러 환율에 대해 Tri-power 혹은 Quad-power quarticity 같은 파워변동성을 이용한 점프통계량에 의하면, 한국의 대미 달러 환율은 이틀 만에 한 번씩 불규칙적이고 불연속적인 예측할 수 없는 점프가 발생한 것으로 나타났다.

Abstract

This paper analyzes and compares the recent realized continuous volatility and discrete jump volatility of the exchange rate of Korean won versus US dollar returns using the ultra-high frequency five minute returns spanning the period from year 2003 through 2010. The volatility of Korean won appeared considerably large in years 2006, 2007 and 2009 during U.S. subprime mortgage crisis and then it became to decrease gradually right after year 2009 during which the world financial crisis appeared. The empirical results show that many significant jumps appeared in the middle of year 2004, 2006 and 2008. Especially before and after 2009, there were the extremely large and discrete jumps and large and discrete jumps continued until 2010. This paper adopts the jump statistics and jump probabilities using tripower and quadpower quarticity, respectively and then estimates the several jump probabilities at different critical values. The empirical results show that Korean won's five minute returns against the US dollar appeared to have the jump probability that there is at least one significant jump per two days during January 2003 through January 2010 at the common critical level.

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