seasonally adjusted


(economics) adjusted for the time of year the data refer to.

economic statistics are often reported as rates of change from month to month, or quarter to quarter. however, some months, such as november and december, have very high retail sales, while may through september have very high home sales. for this reason, data is sometimes “seasonally adjusted” to offset ordinary seasonal variations.

the us federal reserve system reports changes in gdp from quarter to quarter in annualized form; so, for example, during the last quarter of 2004, us gdp was (about) $3,044.6 billion. but it was reported as an annualized (and seasonally adjusted) $11734.9. if you divide that by 4 you get 2957.8, which reflects the fact that the fed shaved 86.8 billion off its estimate of economic activity for 2004q4 and reallocated it to q1 & q2.

the reason the fed (and everyone else) does this is to measure economic change separately from the usual seasonal change in business activity.
bill: hey! this data on gdp growth is way different from that data.

anna: that’s because one set of data is seasonally adjusted. the fed tweaked the numbers so economic growth from quarter to quarter reflects changing economic conditions, instead of ordinary yearly cycles.

bill: you mean it’s not an evil plot?

anna: it’s an evil plot to make you forget about christmas shopping season and labor day white sales.

bill: gasp! you mean the fed is behind the war on christmas?????

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Disclaimer: seasonally adjusted definition / meaning should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. All content on this website is for informational purposes only.