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Current population survey (US)
The current population survey (CPS)〔(Current Population Survey (CPS) Main Page )〕 is a statistical survey conducted by the United States Census Bureau for the Bureau of Labor Statistics (BLS). The BLS uses the data to provide a monthly report on the Employment Situation.〔(Employment Situation )〕 This report provides estimates of the number of employed people and the number of unemployed people in the United States. The monthly unemployment rate is also computed from the data collected from the Current Population Survey. A readable Employment Situation Summary〔(Employment Situation Summary )〕 is provided monthly. Available annual estimates include employment and unemployment in large metropolitan areas. In addition, private think tanks and other organizations use the CPS data for their own research.
The CPS began in 1940, and responsibility for conducting the CPS was given to the Census Bureau in 1942.〔(Chapter 1: Labor Force Data Derived from the Current Population Survey )〕 In 1994 the CPS was redesigned. CPS is a survey that is: employment-focused, enumerator-conducted, continuous, and cross-sectional. CPS is a monthly survey of about 60,000 households. The BLS increased the sample size by 10,000 as of July 2001.〔(【引用サイトリンク】title=Expansion of the Current Population Survey Sample Effective July 2001 )〕 The sample represents the civilian noninstitutional population. The survey asks about the employment status of each member of the household 15 years of age or older as of the calendar week containing the 12th day of the month. Based on responses to a series of questions on work and job search activities, each person 16 years and over in a sample household is classified as employed, unemployed, or not in the labor force.
==Methodology==
Approximately 60,000 households are eligible for the CPS. Sample households are selected by a multistage stratified statistical sampling scheme. A household is interviewed for 4 successive months, then not interviewed for 8 months, then returned to the sample for 4 months after that. An adult member of each household provides information for all members of the household.
As part of the demographic sample survey redesign,〔(【引用サイトリンク】url=http://www.whitehouse.gov/sites/default/files/omb/assets/OMB/expectmore/summary/10001178.2003.html )〕 the CPS is redesigned once a decade, after the decennial census. The most recent CPS sample redesign began in April 2014.〔(【引用サイトリンク】url=http://www.bls.gov/cps/sample_redesign_2014.pdf )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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