Causality Analysis of Point Events in GIS Environments • Naresh Kumar, Brown University

County Child Poverty Rates in the U.S.: A Spatial Econometric Approach • Paul R. Voss, University of Wisconsin at Madison ; David D. Long, University of Wisconsin at Madison ; Roger B. Hammer, University of Wisconsin at Madison ; Samantha Friedman, George Washington University

Contrast or Continuum? The Creation and Application of an Urban Gradient Index Using Remotely Sensed Imagery and GIS • John R. Weeks, San Diego State University

The Spatial Diffusion of Fertility in Brazil: How Large Is the Effect? • Joseph E. Potter, University of Texas at Austin ; Carl P. Schmertmann, Florida State University ; Suzana M. Cavenaghi, Universidade Estadual de Campinas