Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Clustering

  • Michael FranzenEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_1181

Synonyms

Cluster analysis

Definition

Clustering can be thought of as the obverse of factoring. In factor analysis, observations are correlated with each other, and the correlation matrix is examined to see which items covary among themselves and which therefore can be combined into a simpler structure of factors composed of items. In cluster analysis, the correlation matrix is examined to see which individuals or observations covary among themselves and can be represented by clusters composed of different observations. Once the groups of individuals are composed, they are compared to each other in order to see if some external correlate exists.

For example, a large group of patients might be administered a series of cognitive measures. The scores on those measures are examined to see which individuals seem to be most similar to each other and can be clustered. Once the groups are empirically formed, their characteristics are examined to see if age or diagnosis or injury severity...

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References and Readings

  1. Corter, J. (1996). Tree models of similarity and association. Thousand Oaks: SAGE.CrossRefGoogle Scholar
  2. Kaufman, L., & Rousseeuw, P. (2005). Finding groups in data: An introduction to cluster analysis. Hoboken: Wiley.Google Scholar
  3. McIntyre, R. M., & Blashfield, R. K. (1980). A nearest-centroid technique for evaluating the minimum-variance clustering procedure. Multivariate Behavioral Research, 15, 2225–2238.CrossRefGoogle Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Allegheny General HospitalPittsburghUSA