Estimates and compares rate differences of continuous character evolution under Brownian motion and a new set of Ornstein-Uhlenbeck (OU) models that allow the strength of selection and drift to vary across selective regimes.
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Checking for at least m shifts for m regimes, following Ho and Ané #7
https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/2041-210X.12285, after figure 2