(ECONOMICS) Persons unemployed 15 weeks or longer, as a percent of the civilian labor force.
The US Bureau of Labor Statistics regularly publishes six estimates of unemployment. The others are U-2, U-3, U-4, U-5, and U-6. Eurostat publishes one monthly estimate of unemployment for the European Union, which is approximately midway between U-3 and U-4.
The unemployment statistics for the USA are collected through a monthly Current Population Survey (CPS) (also known as the household survey) and an establishment survey.
Analysts use U-1 as a measure of the proportion of people that can no longer replace employment earnings with unemployment insurance or savings.