Can intervention indices detect central bank's actual intervention behaviour?

This article employs the Weymark (1997) and Baig et al. (2003) models to evaluate the central bank's intervention behaviour and utilizes ex post intervention news to check the models' estimation results. Empirical results show that the Baig et al. model's evaluation performance in intervention behaviour is inferior to the Weymark model. The scale of intervention index is not an excellent indicator to detect intervention behaviour. Intervention indices and intervention news all support that the intervention frequency in expansion period is higher than in recession period and in face of fatal events the intervention exhibits cluster phenomenon.