BLS Information

Frequently Asked Questions (FAQs)

Question: What is seasonal adjustment?

Answer: Seasonal adjustment is a statistical technique which eliminates the influences of weather, holidays, the opening and closing of schools, and other recurring seasonal events from economic time series. This permits easier observation and analysis of cyclical, trend, and other nonseasonal movements in the data. By eliminating seasonal fluctuations, the series becomes smoother and it is easier to compare data from month to month.

Last Modified Date: November 14, 2008

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