Source: Sahm, Claudia  

Release: Sahm Rule Recession Indicator  

Units:  Percentage Points, Seasonally Adjusted

Frequency:  Monthly

Sahm Recession Indicator signals the start of a recession when the three-month moving average of the national unemployment rate (U3) rises by 0.50 percentage points or more relative to the minimum of the three-month averages from the previous 12 months.

This indicator is based on "real-time" data, that is, the unemployment rate (and the recent history of unemployment rates) that were available in a given month. The BLS revises the unemployment rate each year at the beginning of January, when the December unemployment rate for the prior year is published. Revisions to the seasonal factors can affect estimates in recent years. Otherwise the unemployment rate does not revise.

Source: Chauvet, Marcelle

Source: Piger, Jeremy Max  

Release: U.S. Recession Probabilities  

Units:  Percent, Not Seasonally Adjusted

Frequency:  Monthly

Smoothed recession probabilities for the United States are obtained from a dynamic-factor markov-switching model applied to four monthly coincident variables: non-farm payroll employment, the index of industrial production, real personal income excluding transfer payments, and real manufacturing and trade sales. This model was originally developed in Chauvet, M., "An Economic Characterization of Business Cycle Dynamics with Factor Structure and Regime Switching," International Economic Review, 1998, 39, 969-996.

For additional details, including an analysis of the performance of this model for dating business cycles in real time, see:
Chauvet, M. and J. Piger, "A Comparison of the Real-Time Performance of Business Cycle Dating Methods," Journal of Business and Economic Statistics, 2008, 26, 42-49.

For additional details as to why this data revises, see FAQ 3.