The Message in Daily Exchange Rates: A Conditional-Variance Tale
每日汇率中的信息:一个条件方差的解释AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确以汇率时间序列的单位根、GARCH条件方差和厚尾为分析对象,对应时间序列与金融波动率。
每日汇率中的信息:一个条件方差的解释AI 解读 ↓
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Formal testing procedures confirm the presence of a unit root in the autoregressive polynomial of the univariate time series representation of daily exchange-rate data. The first differences of the logarithms of daily spot rates are approximately uncorrelated through time, and a generalized autoregressive conditional heteroscedasticity model with daily dummy variables and conditionally t-distributed errors is found to provide a good representation to the leptokurtosis and time-dependent conditional heteroscedasticity. The parameter estimates and characteristics of the models are found to be very similar for six different currencies. These apparent stylized facts carry over to weekly, fortnightly, and monthly data in which the degree of leptokurtosis and time-dependent heteroscedasticity is reduced as the length of the sampling interval increases.