Source: U.S. Bureau of Labor Statistics
The Federal Reserve Bank of St. Louis seasonally adjusts this series by using the 'statsmodel' 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 'statsmodel' X-13ARIMA-SEATS package can be found at https://www.statsmodels.org/dev/generated/statsmodels.tsa.x13.x13_arima_analysis.html. More information on X-13ARIMA-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: Durable Goods: Motor Vehicle Parts Manufacturing in Michigan [SMU26000003133630001SA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/SMU26000003133630001SA, April 20, 2019.