Return a posterior of shift locations
Lposterior(chain, tree, burnin = 0, simpar = NULL, mag = TRUE)A bayouMCMC chain
A tree of class 'phylo'
A value giving the burnin proportion of the chain to be discarded
An optional bayou formatted parameter list giving the true values (if data were simulated)
A logical indicating whether the average magnitude of the shifts should be returned
A data frame with rows corresponding to postordered branches. pp indicates the
posterior probability of the branch containing a shift. magnitude of theta2 gives the average
value of the new optima after a shift. naive SE of theta2 gives the standard error of the new optima
not accounting for autocorrelation in the MCMC and rel location gives the average relative location
of the shift on the branch (between 0 and 1 for each branch).