Harvey et al. (1994) presented daily observations for the weekday closing exchange rates for the U.K. Sterling/U.S. Dollar from 1/10/81 to 28/6/85.
data("exch")
A data frame with 944 observations on the following 4 variables.
rt
exchange rate at time t
yt
mean-correted returns
yt1
one lag of yt
yt12
yt1*yt1
Harvey, A.C., Ruiz, E. and Shephard, N. (1994). Multivariate stochastic variance models. Review of Economic Studies, 61, 247--264.