Dr. Lorna Grace Okotto (Jaramogi Oginga Odinga University of Science and Technology) led a paper at Amsterdam International Water Week, highlighting how geospatial data can be used to support robust post hoc impact evaluations. Her paper looked at how control areas were selected for an evaluation of the delegated management model in Kisumu and its impact on water safety. The approach, which involved coarsened exact matching to minimise statistical imbalance in the characteristics of intervention versus control areas, has potential to be used more widely in post hoc evaluations of WASH (water, sanitation and hygiene) interventions, which are often community-based.
