What is the test for whether a right of action is conferred by a federal statute?

The question whether a private right of action is conferred by a federal statute is essentially one of interpreting congressional intent. Middlesex County Sewerage Authority v. National Sea Clammers Ass'n, --- U.S. ----, 101 S.Ct. 2615, 69 L.Ed.2d 435 (1981). That inquiry is facilitated by applying the fourfold test announced in Cort v. Ash, 422 U.S. 66, 95 S.Ct. 2080, 45 L.Ed.2d 26 (1972). The test is: (1) Is the plaintiff "one of a class for whose especial benefit the statute was created?" ⁹ (2) Is there any indication of a legislative intent to fashion such a remedy? (3) Is it consistent with the underlying legislative scheme to imply such a remedy? (4) Is the cause of action one traditionally relegated to state law, so that an implied federal cause of action would be inappropriate?