Probabilistic preferences of Likert scale data by empirical distributions

This R-code is intended for multicriteria decision support problems solved by the Composition of Probabilistic Preferences (CPP), created by Professor Annibal Parracho Sant´Anna. The two functions in this code calculate the joint probabilities of alternatives maximizing (PMax) and minimizing (PMin) their preferences in a criterion. The measures of the problem's decision matrix are the frequencies of responses to the Likert scale values collected by questionnaires. Version 2.0 added the "min" method for ranking ties and error calculation in the example.