“…Fariza et al [27] used the hierarchical clustering method to provide a new method to diphtheria risk analysis in Surabaya based on multiple parameters, including (Diphtheria, Tetanus Pertussis) immunization, number of diphtheria sufferers, and population density. The 2019 predictions reveal that using a single linkage rather than an average or complete linkage resulted in a lower diphtheria risk level of susceptibility with the least variance of 4.43 10-5.…”