Sensitivity Analysis of Fuzzy Cluster Analysis Results for Peer Neighborhoods Based on Socioeconomic and Demographic Population Characteristics.

DPU = Normalized average square error, values close to 1 are hard solutions; FPU = Dunn's normalized partition coefficient , values close to 1 are fuzzy solutions; PN = Peer Neighborhood.*One wants to identify a solution that has a high FPU index and low DPU index without being too close to a completely fuzzy solution (where FPU = 1 and DPU = 0).