In the world of economics, finance, and business journalism, numbers drive the narrative. Headlines scream that "Unemployment is down" or "Retail sales have hit a record high." However, buried in the footnotes or the fine print of these reports often lies a crucial distinction that can change the entire story: whether the data is or Not Seasonally Adjusted (NSA) .
“They’re erasing the raw truth,” she whispered. “Replacing it with the smoothed version.” not seasonally adjusted
When data is "Not Seasonally Adjusted," it represents the actual, reported value of activity during that specific time period. It is the "raw" number before statisticians apply mathematical formulas to smooth out the bumps. In the world of economics, finance, and business
and tourism often slow down during winter months in cold climates. “Replacing it with the smoothed version
While NSA data offers clarity, it has a significant downside:
Unadjusted versus Seasonally-adjusted Data: An Example ... Seasonally-adjusted data help uncover short and long-term trends in RPM... Bureau of Transportation Statistics (.gov) Not Seasonally Adjusted - Fiscal Lab on Capitol Hill Not seasonally adjusted means the data in question has not been subjected to the process by which a data series is adjusted to acc... Fiscal Lab on Capitol Hill 'Tis the season for adjustment | FRED Blog Jul 27, 2017 —
Three days later, the Bureau’s website crashed under the weight of 27 million downloads. Not because of a seasonal pattern. Not because of a model. But because people finally saw the world as it was—spiky, weird, and gloriously unadjusted.