Source: U.S. Bureau of Labor Statistics
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 X13-ARIMA-SEATS Seasonal Adjustment Program. More information on the 'x12' package can be found at https://cran.r-project.org/web/packages/x12/index.html. More information on X13-ARIMA-SEATS can be found at https://www.census.gov/srd/www/x13as/.
Federal Reserve Bank of St. Louis and U.S. Bureau of Labor Statistics, All Employees: Professional and Business Services: Management of Companies and Enterprises in Montgomery County-Bucks County-Chester County, PA (MD) [SMU42338746055000001SA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/SMU42338746055000001SA, January 23, 2019.