I want to test the hypothesis that a group of vectors in 3D space, say given by a long list of xyz coordinates from some experiment, have no preferred direction. Is it sufficient to pick some direction in space, say the x-axis, and calculate the cosine angle between each data vector and this direction, and look at the mean cosine angle?
Thanks,
-nuun



A test for randomness of direction of vector data
<http://onlinelibrary.wiley.com/doi/10.1111/j.1365-246X.1956.tb05561.x/abstract>


