data decisiveness (DD)
Glossary of "Cladistics (2nd ed.)" by Kitching et al. (1998)
- A measure of the degree to which a data matrix is decisive. Data decisiveness is calculated as the ratio of ( - S) to ( - M), where S is the observed length of the most parsimonious cladogram, is the mean length of all possible bifurcating cladograms and M is minimum possible length of a cladogram were there no homoplasy in the data.
- is S with overline.
- Kitching, I. J., Forey, P. L. Humphries, C. J. & Williams, D. M. 1998. Cladistics, 2nd ed.: the Theory and Practice of Parsimony Analysis. -xii + 228 pp. Oxford University Press, New York.