OptM - Estimating the Optimal Number of Migration Edges from 'Treemix'
The popular population genetic software 'Treemix' by
'Pickrell and Pritchard' (2012)
<DOI:10.1371/journal.pgen.1002967> estimates the number of
migration edges on a population tree. However, it can be
difficult to determine the number of migration edges to
include. Previously, it was customary to stop adding migration
edges when 99.8% of variation in the data was explained, but
'OptM' automates this process using an ad hoc statistic based
on the second-order rate of change in the log likelihood.
'OptM' also has added functionality for various threshold
modeling to compare with the ad hoc statistic.
