[The use of non-Euclidean metrics in epidemiological classifications].

A non-Euclidean metric, stable to pollutions in sample data, for hierarchical cluster analysis in epidemiology is proposed. The simplicity of calculations permits its easy use in practice. On the basis of this metric the towns of Tula Province have been grouped according to morbidity rates in the shigellosis of Flexner and Sonne with the conjugated value of parameters.