The dataset logReturns contains four columns:
date_USD and USD give the date and value of the monthly maxima
of the log-return exchange rate GBP/USD, while date_JPY and JPY
give the date and value of the monthly maxima of the log-return exchange rate
GBP/JPY.
A \(286 \times 4\) matrix. The first and third columns are of type
"character", while the second and fourth columns are of type
"numeric".