The West African Spatial Analysis Prototype is an attempt to gather existing demographic data collected through the Demographic and Health Surveys of countries in the West Africa region, identify their geographic coordinates, and place them within a geographic database and analysis system. These data are to be integrated with non-demographic data for geographic areas, such as climate, agriculture, etc. to provide more understanding and context to changes in demographic phenomena and the welfare of the population living in W.A. This understanding will help orient, plan, monitor, and evaluate programs to improve the health and welfare of the W.A. region.
A principle intention of the WASAP project is to study the impact of the establishment/improvement of health facilities on trends in several population and health related statistics. To evaluate this impact, repeated measurements should be done in the same units noting the change in availability of services and the resulting change in use and outcomes. However, since the first round surveys included in the WASAP project were not planned for re-survey, new units were and will be used in subsequent surveys. There is a need to identify groups of "comparable" units in earlier and later surveys in order to track changes over time within these groups. One possibility is to use the survey information to identify comparable groups of units. This research note outlines a procedure for producing these units and provides a formula for assigning old and new units to the comparable groups.