In this paper, we opted for three different methods to calculate the unconditional volatility
series. The first one is constructed by computing one standard deviation from the mean in rolling
windows with 4, 6, 8 and 12 observations in each window (series are computed as the first
difference of the natural logarithm of the variable on a monthly basis). The rolling window
procedures were chosen to maintain the sample size. The second one considers the variances,
instead of the standard deviation. Finally, we tested a VAR between the price index (IPCA) and the
exchange rate (E) and analyzed the resulting variance decomposition.