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Do Unhappy Couples Have Anything in Common?
Leo Tolstoy famously opens his novel Anna Karenina with the words, "All happy families are alike; each unhappy family is unhappy in its own way." Statisticians have derived from here something they've come to call the "Anna Karenina principle": roughly, the idea that success in any endeavor requires that everything go right, but remove a single important prerequisite, and your endeavor will fail. [1] Say the preconditions of success are A, B, C, and D.
