Spatial Modeling, with Application to Complex Survey Data: Discussion of   "Model-based Geostatistics for Prevalence Mapping in Low-Resource Settings",   by Diggle and Giorgi
  Prevalence mapping in low resource settings is an increasingly important endeavor to guide policy making and to spatially and temporally characterize the burden of disease. We will focus our discussion on consideration of the complex design when analyzing survey data, and on spatial modeling. With respect to the former, we consider two approaches: direct use of the weights, and a model-based approach using a spatial model to acknowledge clustering. For the latter we consider continuously indexed Markovian Gaussian random field models. 
Jon Wakefield, Daniel Simpson, and Jessica Godwin
stat.ME