nroAggregate            Regional averages on a self-organizing map
nroColorize             Assign colors based on value
nroKmeans               K-means clustering
nroKohonen              Self-organizing map
nroLabel                Label pruning
nroMatch                Best-matching districts
nroPermute              Permutation analysis
nroPlot                 Plot a self-organizing map
nroPreprocess           Data cleaning and standardization
nroSummary              Estimate subgroup statistics
nroTrain                Train Self-Organizing Map
