Census of Population and Housing, 1990 [California Reformatted Data]: Public Use Microdata Sample [1% and 5% PUMS]

Public Use Microdata Sample (PUMS) files contain records representing 1-percent or 5-percent samples of the occupied and vacant housing units in the U.S. and the people in the occupied units. Group quarters people also are included. The file contains individual weights for each person and housing unit, which when applied to the individual records, expand the sample to the relevant total. Microdata are for those users who want to create do-it-yourself tabulations. Microdata files show the full range of responses made on individual questionnaires. For example, how one household or one household member answered questions on occupation, place of work, and so forth. The files contain records for a sample of all housing units, with information on the characteristics of each unit and the people in it. For more information about these data, see the PUMS codebooks.