Seasonal Adjustment Filters Research Articles

Corrigenda: A Comparison of a Modified "Hannan" and the BLS Seasonal Adjustment Filters.

Corrigenda: A Comparison of a Modified "Hannan" and the BLS Seasonal Adjustment Filters.

A Comparison of a Modified “Hannan” and the Bls Seasonal Adjustment Filters

Abstract In a previous paper [12], an attempt was made to show how spectral techniques could be used to compare the effects of two seasonal adjustment procedures on the series to which they were applied. The two procedures compared were: (a) the technique currently used by the Bureau of Labor Statistics for seasonally adjusting employment, unemployment, and labor force monthly statistics, and (b) the so-called “residual” method, proposed by Brittain [2], Samuelson [16], and others. Spectra of the original and the seasonally adjusted series and the cross spectrum of the two were used to aid in the assessment of whether either procedure removed more than could be considered seasonal, introduced spurious regularities, and/or distorted temporal relationships. It was concluded that both techniques removed more than seasonal effects from, and produced some temporal distortion in, the series to which they were applied. Neither method appeared to be superior to the other. It is the purpose of this paper to carry ...

A Comparison of a Modified "Hannan" and the BLS Seasonal Adjustment Filters

A Comparison of a Modified "Hannan" and the BLS Seasonal Adjustment Filters