Hi all,

I have a non-rooted non-ultrametric tree and a corresponding set of a single 
trait values for each one of the tips. 
I’m interested whether it follows a BM model or an OU.

Reading previous comments in the archive, I understood that running an OU 
process is inadequate in a case of non-ultrametric trees, however I did not 
fully understand why. 
As I use ouch package, what are the consequences of running an unrooted tree? 
And a non-ultrametric one? 

What would be the best way assessing this issue? Diversitree should be more 
reliable?

I will appreciate any explanation and help,
Danielle Miller 
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