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Application of the Tobit model with autoregressive conditional heteroscedasticity for foreign exchange market interventions

Ho-Chyuan Chen, Kuang-Liang Chang and Shih-Ti Yu

Japan and the World Economy, 2012, vol. 24, issue 4, 274-282

Abstract: In this empirical study, we apply the Tobit-GARCH model to investigate the intervention function of the Bank of Japan (BoJ) in the JPY/USD exchange market. The proposed model has the advantage of handling intervention data with both a majority of zero observations and conditional heteroscedasticity. Thus, the model provides better estimates of the intervention function than such conventional models as the standard Tobit, OLS, Probit, and traditional GARCH models. Results show that the intervention behavior of the BoJ is affected more by its half-year long-term target than its previous-day short-term target, and the BoJ generally follows the policy of “leaning against the wind”. The US-JP interest rate spread was never a trigger of BoJ's interventions during the sample period. The BoJ did not respond to the domestic stock index by the sales-intervention of the JPY, even when the economy was sluggish during the lost decade (1992–2004). However, its intervention behavior was significantly affected by U.S. interventions and was significantly persistent across some of the periods.

Keywords: Tobit GARCH; Central bank intervention; Bank of Japan; Censored data; Probit (search for similar items in EconPapers)
JEL-codes: E31 E58 (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1016/j.japwor.2012.06.002

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