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Phylogenetic Investigator

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Phylogenetic Investigator (PI) is a software package designed to facilitate creative problem-solving in phylogenetic analysis for the purpose of teaching and learning phylogenetic inference. Users can identify characters and states, polarize characters, and engage in directed-search phylogenetic tree construction.

PI also allows the user to

  • make inferences and represent them one step at a time
  • vary representational features of their trees (such as angle of divergence and time between speciation events)
  • create reticulate tree patterns
  • view all of the character transformations at one time.


In addition, PI can generate plausible data stochastically for modeling and practicing tree construction.