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Discussion Paper
Modeling time series when calendar effects are present
Journal Article
Seasonal adjustment methods for the monetary aggregates
Working Paper
Estimated variance of seasonally adjusted series
For model-based seasonal adjustment, there are explicit formulas for obtaining the variance of the seasonal factors or the seasonally adjusted series. For series adjusted with X-11 or X-12, variance estimates are generally based on a linear approximation of the seasonal adjustment procedure. The work of Pfeffermann (1992) extends earlier work by Wolter and Monseur. This study uses simulated series and comparisons of alternative seasonal adjustment results for a few economic series to assess the accuracy of variance estimates. Pfeffermann's method gives good results when the true seasonal is ...
Working Paper
Joint seasonal adjustment of economic time series
Discussion Paper
Calendar adjustment and time series