Estimated percentage-point understatement of CPS-derived unemployment rate, 2001–2002 and 2017–2018


Estimated percentage point understatement
July 2001–September 2002 1.6  
January 2017–March 2018 1.9  


Notes: The data start in July 2001 and end in March 2018. The chart compares the first 15 months of data with the last 15 months. The adjustments include all inconsistencies identified by Ahn and Hamilton (see source below), not just nonresponse.

Source: Hie Joo Ahn and James D. Hamilton, Measuring Labor-Force Participation and the Incidence and Duration of Unemployment, March 16, 2019, revised December 13, 2019, supplemental data

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