|--Real Time Data
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 (1) make inferences and
represent them one step at a time, (2) vary representational features
of their trees (such as angle of divergence and time between speciation
events), (3) create reticulate tree patterns, and (4) view all of the
character transformations at one time. In addition, PI can generate plausible
data stochastically for modeling and practicing tree construction.
PI provides tools for managing and manipulating up to 20 characters of
binary phylogenetic data for 15 or fewer taxa. PI has been designed with
2 datasets in mind: the Caminacules and the Dendrogrammaceae (both are
included in the Support Materials folder on the Library CD), but other
datasets can be adapted for use.
PI uses two windows for data management (Chars & States and Data Matrix)
and one for tree construction (Phylogenetic Tree).
The compact version of the Chars & States window
is shown on the left. Characters are entered into the top field.
Once entered they appear in the scrolling list. States are entered
into the lower fields. The three buttons at the bottom allow exchanging
character state names (left button), reversing polarity of data
in the data matrix (right button), or both (middle button).
The Data Matrix window is shown above. Each row in the matrix
represents the data for a taxon and each column represents a character.
Characters are coded with symbols for ancestral (0) and derived
(1) states. At the upper left is the number of unweighted transitions
in the tree. The field at the bottom is user-modifiable and contains
the name of the problem.
One possible phylogenetic tree constructed using the data in
Data Matrix is shown above.
Macintosh or Power Macintosh
- System 6.07 or later; System 7.1 or later for Power Macintosh.
- At least 2MB of available RAM, more for complex models.