This paper evaluates the reliability of variants of five urban shopping models : Central Place theory, the Intervening Opportunities model, Gravity model, the Entropy model, and the Building Research Establishment (BRE) model. For each model variant parameters are estimated against data for four...

The core idea of evolution is that order in living systems emerges from a simple process of variation and selection. In biological systems we usually understand the source of variation as best described by the mechanisms of genetics. If human social systems are evolutionary systems, however, it...

We define residuals for point process models fitted to spatial point pattern data, and we propose diagnostic plots based on them. The residuals apply to any point process model that has a conditional intensity; the model may exhibit spatial heterogeneity, interpoint interaction and dependence on...

This paper reviews the contemporary debate and the now long standing role of CBA in UK and European environmental policy appraisal (EPA) and looks forward to possible future applications. The position taken is that despite its limitations CBA still has an important part to play in EPA. However,...