This paper considers econometric issues related to time series data that have been subject to abrupt governmental interventions. The motivating example for this study is the Brazilian monthly inflation and interest rate series (1974:1- 1994:6) which we use throughout for illustration. These...

We analyse in this article the monthly structure of the Brazilian inflation rate by means of fractionally integrated techniques. This series is characterized by strong government interventions to bring inflation to a low level. We use a testing procedure due to Robinson (1994) which allow us to...