Simulation for generating realistic distance matrices
AG_unifrac.r: Sample code for reading in American Gut data and estimating a Unifrac distance
sim_benchmark.r: Simulate a Unifrac Distance matrix based on benchmark distance matrix from American Gut data with a scaling parameter sigma that adjust effects sizes
sim_Kelly.r: Simulate a Unifrac Distance matrix with pre-specified within-group distance level and effect sizes using techniques from Kelly (2015).
permanova.r: Estimate PERMANOVA power of a distance matrix using bootstrap sampling.