"Political scientists often talk about dyads, by which we simply mean groups of two. In this case, a dyad refers to a pair of TPP countries. If we count up every instance that the United States appears in the same marker as, say, Australia, we can say that the U.S.-Australia dyad occurs with a certain frequency. If we did this for every possible dyad, we could compare the frequency of dyads and get a sense of how often countries’ negotiating positions overlap. The following chart displays the frequency of every possible dyad among the 12 TPP countries. For example, the U.S.-Australia dyad (AU-US) appears 83 times in the leaked text, and is the 43rd most frequent dyad. Note that the order doesn’t matter: a U.S.-Australia dyad is the same as an Australia-U.S. dyad."
http://www.washingtonpost.com/blogs/monkey-cage/wp/2013/11/18/the-united-states-is-isolated-in-the-trans-pacific-partnership-negotiations/
