The TOPD program uses several methods to calculate the difference between two trees. All the methods work with single and multifamily trees using the FMTS program. A random analysis can be made in all of the methods as well.
- Nodal: this method calculates the nodal distance between two trees.
- Split: this method calculates the number of splits that disagree between two trees.
- Quartets & Triplets: the software also calculates quartets, triplets and their indices.
- Disagree: this method compare two trees and returns the taxa that disagree in both trees.