DOI: 10.6077/j5/cn8b0n
title: Current Population Survey, March 1975

description: &lt;p&gt;This data collection supplies standard monthly labor force data as well as supplemental data on work experience, income, and migration. Comprehensive information is given on the employment status, occupation, and industry of persons 14 years old and older. Additional data are available concerning weeks worked and hours per week worked, reason not working full-time, total income and income components, and residence. Information on demographic characteristics, such as age, sex, race, educational attainment, marital status, veteran status, household relationship, and Hispanic origin, is available for each person in the household enumerated. (Source: ICPSR, retrieved 06/23/2011)&lt;/p&gt;
description: Current Population Survey, March [Annual Demographic Files]
description: collection_notes: The sample design used for the CPS is based to a large extent on the distribution of the population reported in the most recent decennial census. Consequently the CPS sample was revised to take account of the results of the 1970 Census, with the changes taking place between December 1971 and February 1973. Therefore some parts of the following description of the new design apply to only a portion of the sample during the transition period. Since March of 1973 the sample has been located in 376 strata comprising 923 counties and independent cities, with coverage in every State ‘and the District of Columbia. Since January 1967, the complete CPS sample can be treated as two identifiable parts, an A sample and a C sample. Either sample alone is a national probability sample available for surveys where the designated households in the combined A and C samples are more than desired. In the new design the A sample is spread over 376 sample PSU’s and the C sample is spread over 266 sample PSU’s. Of the 376 strata within which the A sample is selected, 156 consist of a single PSU, which is necessarily in sample. The sample PSU’s from these strata are called self—representing (SR) and are generally made up of the larger SMSA’s. The other 220 strata of the A sample contain more than one PSU each, and the sample PSUs from these strata are called non—self—representing (NSR), since the sample PSU also represents other PSU’s in the same stratum. Each of these 220 NSR strata contains an A sample PSU which has been selected with probability proportionate to the 1970 Census population of the PSU. The additional PSU’s in the C sample were selected from these areas as follows: The 220 strata were grouped into PSU pairs of strata. From each pair of strata, one stratum was picked at random (each stratum having equal probability of selection). From the selected stratum, one additional PSU was chosen for the C sample with probability proportionate to the size of the PSU. The selection was made independent of the selection of the origins). A sample PSU in the stratum. In 25 strata, the C sample PSU’s chosen were the same as the A sample PSU’s and in 85 cases the sample PSU’s were different. Within each of the sample PSU’s a sample of housing units was designated such that the over—all probability of selection was one—half that used for the A sample. In addition, a C sample at one—half the A sample rate was designated in each of the 156 SR PSU’s. This design results in approximately 47,000 occupied households being eligible for interview each month. Of this number 2000 occupied units, on the average, are visited but interviews are not obtained because the occupants are not found at home after repeated calls or are unavailable for some other reason. -In addition to the 47,000 occupied households there are also about 8000 sample units in. an average month which are visited but are found to be vacant or otherwise not to be interviewed. The combined A and C sample is spread over 461 different PSU’s, 156 of which are SR and the balance NSR.