A Conditional Variance Model for Daily Deviations of an Exchange Rate
提出一个模型，假设汇率日偏离服从高斯分布，其方差取决于过去的偏离，并应用于美元对特别提款权的汇率。
A model for the distribution of daily deviations of an exchange rate is suggested. The distribution is Gaussian with a variance that depends on previous deviations. The model is applied to the exchange rate of the U.S. dollar to special drawing rights.