All Employees: Transportation and Utilities: Transit and Ground Passenger Transportation in Chicago-Naperville-Arlington Heights, IL (MD) (SMU17169744348500001SA)

Source: U.S. Bureau of Labor Statistics  

Source: Federal Reserve Bank of St. Louis  

Release: State and Metro Area Employment, Hours, and Earnings  

Units:  Thousands of Persons, Seasonally Adjusted

Frequency:  Monthly

The Federal Reserve Bank of St. Louis seasonally adjusts this series by using the 'statsmodels' library from Python with default parameter settings. The package uses the U.S. Bureau of the Census X-13ARIMA-SEATS Seasonal Adjustment Program. More information on the 'statsmodels' X-13ARIMA-SEATS package can be found here. More information on X-13ARIMA-SEATS can be found here.

Many series include both seasonally adjusted (SA) and not seasonally adjusted (NSA) data. Occasionally, updates to the data will not include sufficient seasonal factors to trigger a seasonal adjustment. In these cases, the NSA series will be updated normally; but the SA series will also be updated with the NSA data. The NSA series can be located here here.

Some seasonally adjusted series may exhibit negative values because they are created from a seasonal adjustment process regardless of the actual meaning or interpretation of the given indicator.