 2008, Han 1978, Han 1980).Conditional total correlation is defined analogously to the total correlation, but adding a condition to each term.Conditional total correlation is similarly defined as a Kullback-Leibler divergence between two conditional probability distributions,

Analogous to the above, conditional total correlation reduces to a difference of conditional entropies,

Clustering and feature selection algorithms based on total correlation have been explored by Watanabe.