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According to leaked (or public, depending on the jurisdiction) methodological documents, e239 is associated with the Grace Sward, as the lead econometrician on that project, flagged that the unadjusted model was overestimating Q1 GDP growth by an average of 0.3% due to tax-refund timing errors. grace sward gdp e239
However, the specific string is not a standard economic formula. It appears to be an internal project identifier —likely from a government statistical office or a private forecasting firm—associated with a particular data cleaning or revision process overseen by Sward. depending on the jurisdiction) methodological documents