Difference between revisions of "Burnin"
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Latest revision as of 04:53, 13 September 2006
Burnin (or Burn-in or Burning-in).
- Typically the chain will take some time before trees are sampled according to their probability
- Initially probability of trees increases with time
- Programmes need to be allowed to run until the probabilities are fluctuating randomly about a constant mean
- Data generated before the chain reaches a steadystate are discarded
- There are some disadvantages of picking trees near our current tree
- Our very first tree might not have a good P(D|T), and the first part of the chain might be in a valley. This will distort the calculation of posterior probabilities
- In practice: "burning-in" of the chain: start somewhere random, but run the process for a while, and discard the first part of the chain as atypical.
This article is curently a "stub". This means it is an incomplete article needing further elaboration.
I always welcome suggestions, comments, and criticism. If you have something to contribute to this site, please follow this link: Contributing Information. Thank you!
| Topics in phylogenetics |
|---|
| Relevant fields: phylogenetics | computational phylogenetics | molecular phylogeny | cladistics |
| Basic concepts: synapomorphy | phylogenetic tree | phylogenetic network | long branch attraction |
| Phylogeny inference methods: maximum parsimony | maximum likelihood | neighbour joining | UPGMA |
