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Seasonal Adjustment of NIPA data -- by Jonathan H. Wright

In the 2018 comprehensive update of the national income and product accounts, the Bureau of Economic Analysis released not seasonally adjusted data, and modified its seasonal adjustment procedures. I find some indication of residual seasonality in the seasonally adjusted data as published before this update. The evidence for residual seasonality is weaker in the seasonally adjusted data after the update. I also directly seasonally adjusted the aggregate not seasonally adjusted data, and this entirely avoids residual seasonality. The average absolute difference between my seasonally adjusted real GDP data and the current official published version is 1.1 percentage points in quarter-over-quarter annualized growth rates.
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