"Ron Okimoto"  wrote in
>
> You should use an outgroup if you need to know the root.  If you
> don't need to know, leave it unrooted.
>
The problem is you don't always have one. For instance if you have a tree of
human Y non-recombining haplotypes, the nearest outgroup (chimpanzee) is too
distant to be of any practical use.
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