Seasonal Adjustment and Local Calendar Effects in an Argentina´s Monetary Aggregate
The presence of seasonal fluctuations (regular behavior along the year related to weather or institutional factors) invalidates monthly (quarterly) comparisons. In turn, since inter-annual variations depend on the comparison basis being used, they could provide very little information to the short-term analysis. The purpose of this document is, on the one hand, to underline the need of using time series adjusted for seasonality and for calendar effects in the short-term analysis and, on the other hand, to show an application of seasonal adjustment to Bills & Coins (B&C) time series of Argentina in the period 1992-2007. The main contribution of this application, if compared to seasonal adjustments made before, lies in the fact that it incorporates for the first time the local calendar into the seasonal analysis, in addition to taking advantage of other attributes of the seasonal adjustment such as the ad-hoc length of the seasonal and trend-cycle filters which provide a more appropriate adjustment to the data observed in the Argentine economy. The role of the calendar effects to explain the seasonal contribution turned out to be statistically significant though of relative economic importance, with the exception of the month of December. Regarding the seasonal component, the main source behind seasonality has not been modified in the period under analysis. However, the intensity of the seasonal component has changed. B&C seasonal factors suffered a significant reduction from 1997 to date. The reasons are strongly related to the bank service accessibility process and the introduction of new technologies into the Argentine economy since the late 1990s. It is likely that the payment of salaries to employees through bank accounts has been the most influential factor of this bank service accessibility process. As regards seasonality contribution to B&C demand for the period 2003-2007, it is close to ± 3 pp of demand, depending on whether it is a peak (i.e. an increase of demand due to seasonal factors) or a valley (i.e. a lower demand due to seasonal reasons).
Volume (Year): 1 (2010)
Issue (Month): 57-58 (January - June)
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- Findley, David F, et al, 1998. "New Capabilities and Methods of the X-12-ARIMA Seasonal-Adjustment Program," Journal of Business & Economic Statistics, American Statistical Association, vol. 16(2), pages 127-52, April.
- Bell, William R & Hillmer, Steven C, 1984. "Issues Involved with the Seasonal Adjustment of Economic Time Series," Journal of Business & Economic Statistics, American Statistical Association, vol. 2(4), pages 291-320, October.
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