The paper presents the definition of rules for the medical algorithms in some infectious diseases and also the mathematical functions for modeling: interrogation rules to elaborate specific concepts and work methods in HIV/AIDS infection, interrogation rules to elaborate specifically concepts and work methods in SEPSIS, initial conditions regarding the introduction of the notion of stochastic correlation coefficient, determination of the the stochastic correlation coefficient through the method of reciprocal comparison of the variables, determination of the influential ponders through reciprocal comparison of the characteristics, models for the study of the variation of the specific medical criteria of some infectious diseases in the case of adopting the analysis method of reciprocal non comparison