An older story about a Terran on an exploration ship. He is an exponent of a new science which can predict behavior, even of aliens, based on the theories of his mentor. He correctly predicts the behavior of an alien (perhaps cat-like) being.
There may have been more than one story. This probably dates to the 1950s/60s/70s, though it may be later than that. This is not psychohistory, but perhaps a precursor to that idea.