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Issues in Measuring Differential Access to Public Services

Department of Geography at Columbia University and in the School of Business Administration at New York University, both New York City, N.Y

Avijit Ghosh

Department of Geography at Columbia University and in the School of Business Administration at New York University, both New York City, N.Y

This paper discusses the problems in interpreting the correlation coefficient as a measure of geographical accessibility to public services by income groups. As an alternative a relative index is proposed which incorporates the unique limits to the correlation coefficient in any area and thus allows meaningful comparison of results between areas and services. To illustrate the use and interpretation of the relative index an empirical analysis of differential access is presented.

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