you might find this paper to be useful (Lafleur & Greevy, 2009):
www.tandfonline.com/doi/abs/10.1...
tandfonline.com
Introduction to Permutation and Resampling-Based Hypothesis Tests∗
A resampling-based method of inference—permutation tests—is often used when distributional assumptions are questionable or unmet. Not only are these methods useful for obvious departures from para...