Calculate the (difference in) median beta and M values for the rows specified in probe_rows (descriptive statistics). probe_rows must specify a continuous range of adjacent probes. If a regions shows an high difference (>dM_min) between any pair of samples, the differences are formally tested (Mann Whitney U if n=2, Kruskal Wallis n>2). If n>2 and the omnibus test is significant , pairwise testing is performed to determine which differ significantly.
#calc_stats() is an integrated part of the DMRforPairs() wrapper and is
#not usually called by the user directly. Please see DMRforPairs() for
#an example.