Bry and Boschan routine

In econometrics, the Bry and Boschan routine finds statistical maxima and minima while using certain censoring rules and phase and cycle length constraints. [1], [2]

The OECD has composite leading indicators and turning points that are recession indicators with peak through the trough turning points chronologies determined by the rules in a computer routine (Bry and Boschan)[3]

The U.S. National Bureau of Economic Research (NBER) uses a computer routine (Bry and Boschan) and includes a Phase-Average Trend (PAT) detrending procedure. The turning point detection algorithm is decoupled from the de-trending procedure.[4]


  1. ^ "OECD Composite Leading Indicators: Reference Turning Points and Component Series - OECD".
  2. ^ "Dating the Italian Business Cycle | A Comparison of Procedures | Giancarlo Bruno† Edoardo Otranto | 18th December 2003 Methods page 3" (PDF).
  3. ^ "OECD based Recession Indicators for Major Seven Countries from the Peak through the Trough". FRED, Federal Reserve Bank of St. Louis. April 1, 1957.
  4. ^ "OECD based Recession Indicators for the United States from the Peak through the Period preceding the Trough". FRED, Federal Reserve Bank of St. Louis. February 1, 1947.