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A Perimeter-Based Clustering Index for Measuring Spatial Segregation: A Cognitive GIS Approach

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  • C-M Lee

    (Wharton Real Estate Center, University of Pennsylvania, 3600 Market Street, Philadelphia, PA 19104-2648, USA)

  • D P Culhane

    (School of Social Work, University of Pennsylvania, PA 19104-2648, USA)

Abstract

Many efforts have been made to develop segregation indices that incorporate spatial interaction based on the contiguity concept. Contiguity refers to how similar the concentration of the subject of interest in one areal unit is to that in adjacent areal units. However, highly segregated situations are typically considered to be isolated sections or enclaves rather than smoothly formed peaks of concentration in space. Therefore, highly segregated enclaves may not exhibit contiguity. In this paper, a new index to measure the degree of clustering is developed and it is compared with the existing indices of concentration or segregation. The proposed clustering index ( I c ) tends to give more weight to ‘enclaveness’ rather than contiguity alone. This may be a good property for those cases in which the primary concern of an investigator is the formation of enclaves of a socioeconomic subject, including minority populations, poverty, crime, epidemics, and mortgage red-lining. Additionally, its property of robustness to the citywide rate allows us to perform properly an intercity comparison of a given subject by index score even when the citywide rate varies significantly, unlike the other measures.

Suggested Citation

  • C-M Lee & D P Culhane, 1998. "A Perimeter-Based Clustering Index for Measuring Spatial Segregation: A Cognitive GIS Approach," Environment and Planning B, , vol. 25(3), pages 327-343, June.
  • Handle: RePEc:sae:envirb:v:25:y:1998:i:3:p:327-343
    DOI: 10.1068/b250327
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