Figure 2From: Buruli ulcer disease prevalence in Benin, West Africa: associations with land use/cover and the identification of disease clustersEmpirical variogram and envelopes of residuals from the top-ranked (A) and disease cluster (B) negative binomial regression models. Residuals are from a negative binomial regression model relating Buruli ulcer disease prevalence to landscape attributes in Benin. Envelopes were computed by permutation of the residual values across spatial locations.Back to article page