This article addresses shortcomings in the literature on environmental inequality by (a) setting forth and testing four models of environmental inequality and (b) explicitly linking environmental inequality research to spatial mismatch theory and to the debate on the declining significance of race. The explanatory models ask whether the…

The PUS801000 (Public Use Samples) database was created as a subsample of the Census Bureau's 1980 Public Use Microdata Sample (PUMS) for the purpose of meeting the needs of demographics research. PUMS needed to be reorganized along relational lines by identifying the variables most widely used by researchers and constructing proper relations…

In early 1990, Prince George's Community College (PGCC), in response to declining enrollments, developed an affordable and locally effective geo-demographic cluster system for meeting the college's research and marketing needs. The system, dubbed "PG-TRAK," is based on a model developed 15 years ago as a corporate marketing tool, and involves…