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Segregation derives from the Latin verb “to separate” or “to divide,” and in the social sciences, it defines the separation of a group of people from the rest of the population. Segregation does not have to be a particularly geographical phenomenon—it can involve any manner of separation—but it often takes geographical forms and is most apparent in cities where the social patterns of people are distinct. The study of segregation has become an important topic in human geography. It also lends itself well to the tool kits of geography, from maps to spatial statistics to ethnography. Geographers have discussed segregation in several ways: from helping describe it, to revealing the processes that cause it, to an understanding of what segregation means to those who experience it.

Any group of people can be segregated, and these patterns are apparent in the city. Segregation on the basis of income defines the broad social areas in cities, with neighborhoods divided between low, middle, and higher incomes. Segregation on the basis of life cycle considers the tendency of neighborhoods to be dominated by people at certain stages of their lives, from young adult singles to families with children, to empty nesters and elderly enclaves. There may also be segregation based on lifestyle, as arts-oriented individuals congregate in neighborhoods more suited to their tastes. However, it is on the basis of race and ethnicity that segregation is most often discussed. In diverse cities—which describe most cities—different cultural groups are more or less likely to cluster together. This creates an uneven geography as certain groups may be found in specific parts of the city and almost absent from other districts. Social scientists are more concerned with this sort of segregation because it seems to be less voluntary than the other forms, indicates profound social tensions, or stems from discrimination.

Measures of Segregation

Thematic maps that display the density or proportional representation of particular groups provide a good depiction of how segregation appears. While maps illustrate the stark patterns and divisions between groups, it can be useful to develop more precise measurements. Both sociologists and geographers helped popularize a simple measure of segregation known as the index of dissimilarity, or D. The D index ranges from 0, which indicates that a particular subgroup is evenly dispersed throughout the entire population of a city, to 100 (or 1.0), which indicates complete segregation. With this index and a few others that are calculated in slightly different ways, it is possible to compare the segregation levels of different groups, examine segregation in different cities, or trace the segregation experiences of a group over time. Segregation indices have played a profound role in characterizing the experiences of ethnic and racial groups in cities around the world and have had a powerful effect in shaping public policy.

Traditional segregation measures used census units and were impervious to the geographical relationships between those units. In other words, this information could not account for whether African Americans, say, were concentrated in one census tract but were absent in an adjacent one. New geographic technologies have allowed researchers to modify segregation indices to measure the spatial relationships between units and to offer a more refined measurement.

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