We estimate FIGARCH models with data sets of daily and thirty minute returns on the Deutsche mark-US dollar exchange rate. The results point to the importance of accurately modelling the persistence properties of volatility in terms of structural breaks and long memory, and controlling for stochastic intra-daily repetitive patterns.
Key words: FIGARCH; IGARCH; Volatility; high frequency data, long memory.
JEL classification: C22; F31; Gil