Source: U.S. Bureau of Labor Statistics
Total wages are the wages paid by Unemployment Insurance covered employers during the calendar quarter, regardless of when the services were performed.
The Federal Reserve Bank of St. Louis seasonally adjusts this series by using the 'x12' package from R with default parameter settings. The package uses the U.S. Bureau of the Census X-12-ARIMA Seasonal Adjustment Program. More information on the 'x12' package can be found at http://cran.r-project.org/web/packages/x12/x12.pdf. More information on X-12-ARIMA can be found at http://www.census.gov/srd/www/x12a/.
Federal Reserve Bank of St. Louis and U.S. Bureau of Labor Statistics, Total Quarterly Wages in Chicago-Naperville-Elgin, IL-IN-WI (MSA) [ENUC169830010SA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/ENUC169830010SA, March 24, 2018.