, Volume 51, Issue 3, pp 429–451

Extended similarity trees

  • James E. Corter
  • Amos Tversky

DOI: 10.1007/BF02294065

Cite this article as:
Corter, J.E. & Tversky, A. Psychometrika (1986) 51: 429. doi:10.1007/BF02294065


Proximity data can be represented by an extended tree, which generalizes traditional trees by including marked segments that correspond to overlapping clusters. An extended tree is a graphical representation of the distinctive features model. A computer program (EXTREE) that constructs extended trees is described and applied to several sets of conceptual and perceptual proximity data.

Key words

proximities nonhierarchical clustering additive trees feature models 

Copyright information

© The Psychometric Society 1986

Authors and Affiliations

  • James E. Corter
    • 2
  • Amos Tversky
    • 1
  1. 1.Stanford UniversityUSA
  2. 2.Teachers CollegeColumbia UniversityNew York

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