Fig 1.
Spatial distribution of individuals in the Trujillo trial where each point represents a location, i.e. a house or, in the case of identical coordinates, a set of houses.
There is one tile for each point, obtained using by Dirichlet tessellation. Dark tiles are intervention locations, white ones are control. Double lines are tile borders between clusters. The insets to the right are zoomed versions of the areas inside the rectangles.
Fig 2.
Pairing of clusters in the Trujillo trial.
Darker clusters are in the intervention arm. Clusters with the same number are in the same matched pair (one in the intervention and one in the control arm). Hatching is used to show different sections of clusters which appear to be non-contiguous, due to limited GPS accuracy and steep terrain.
Fig 3.
Number of containers positive for immature stages of the mosquito vector species Aedes aegypti, at each location, plotted at the centre of the corresponding tile.
The Breteau Index, the endpoint of the trial, is the number of such containers per 100 houses. The dark solid lines surround the intervention clusters.
Fig 4.
Choropleth map of the Dirichlet tiles around each location.
Darker shadings indicate greater surroundedness by intervention locations according to the disc measure, i.e. number of intervention locations within a radius of 200m. Control regions are those inside the white boundary.
Fig 5.
Pairwise intervention effect by surroundedness.
Posterior distributions of the pairwise intervention effect (solid thick lines) for increasing values of surroundedness within intervention locations. The thickness of the solid lines is proportional to this surroundedness. The posterior distribution of the intervention effect from the standard (non-spatial) model is plotted with a dotted line.