I ran into a similar problem a number of years ago, and came upon the Rayleigh test. It tests the null hypothesis that values are distributed uniformly around a circle; i.e., if there is/is not a significant mean angle that the data are tending toward. Zar's biostatistics book has a good explanation of the test, but I'm sure you can find info elsewhere. If it helps, I can send a reprint PDF of my paper that contains an example.
Joshua Caplan, PhD Postdoctoral Associate Department of Ecology, Evolution, and Natural Resources Rutgers University 14 College Farm Rd, New Brunswick, NJ 08901 p 732-932-9383 f 732-932-8746 [email protected]
