For a set of n random variables \{X_1,\ldots,X_n\}, the dual total correlation D(X_1,\ldots,X_n) is given by .
where H(X_{1},\ldots,X_{n}) is the joint entropy of the variable set \{X_{1},\ldots,X_{n}\} and H(X_i \mid \cdots ) is the conditional entropy of variable X_{i}, given the rest.