Dramatic Decline in Household Overcrowding? An Analysis of California and Los Angeles

According to data from the 2000 Decennial Census and the 2005-07 American
Community Survey, household overcrowding has decreased drastically between those
two periods, declining by over half in some cases. This change would indicate either an
equally dramatic improvement in housing conditions or a serious incompatibility in data
from the two sources. This technical brief examines several issues by reviewing
changes in the two factors that are used to calculate persons per room, and analyzes
their relative contribution to the apparent decline in overcrowding. The decrease can be
attributed to observed changes in the distributions of housing units and households by
size, with the former playing a much larger role. The brief concludes with speculations
about possible data problems due to changes in the survey methods used in 2000 and
in 2005-2007.

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