BASTOURRE and CARRERA (2004) attribute the lack of macroeconomic studies about
volatility to the lack of a pattern to define or to measure volatility. According to them, the use of
rolling windows, instead of subsamples, has the advantage of reducing information loss (resultant
from the reduced sample size). However, this procedure is also limited since it is not an easy task
to determine the ideal number of observations in a window. In addition , the method to compute
these series implies a high correlation, which may affect the quality of estimators. Furthermore, it is
possible that the true relation between the volatilities of two different series is altered. For instance,
once the exchange rate regime varies over time, a certain window may contain two different
regimes.