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By Shaidurov V. V., Timmerman G.

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The industrial classification system used in the 1980 Census was based on the 1972 Standard Industrial Classification (SIC) system, as modified in 1977. The adoption of the new industrial system had much less of an adverse effect on historical comparability than did the new occupational system. Beginning in January 1992, the occupational and industrial classification systems used in the 1990 Census were introduced into the CPS. There were a few breaks in comparability between the 1980 and 1990 census-based systems, particularly within the “technical, sales, and administrative support” categories.

Beginning in January 1998, new estimating procedures were introduced, which reduced labor force by about 229,000 and employment by 256,000 but raised unemployment by 27,000. New information about immigration and emigration was also incorporated which increased the Hispanic population by about 57,000. Unemployment rates were not significantly affected. S. LABOR STATISTICS (BERNAN PRESS) Beginning in January 1999, new information on immigration raised the population by about 310,000, with differing impacts on different demographic groups.

The annual CPS data on the employment characteristics of families and family members begin with data for 1995. These data are not strictly comparable with family data derived from the March CPS. The annual data are derived by averaging the data for each month of the year, whereas the March data refer to that month. The annual average data provide a larger sample size, while the March family data provide a longer historical series. Additional Concepts and Definitions: CPS Supplements In addition to the above concepts and definitions, the definitions below apply to the special labor force data collected annually in the March supplement to the monthly CPS, and the data on tenure usually collected in a February supplement.

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A Cascadic Multigrid Algorithm for Semilinear Indefinite Elliptic Problems by Shaidurov V. V., Timmerman G.

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