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2 results

  • Procrustean Analysis of Matrices with Different Row Order

  • Ingwer Borg
  • Journal:
    Psychometrika / Volume 43 / Issue 2 / June 1978
    Published online by Cambridge University Press:
    01 January 2025, pp. 277-278

  • Procrustean analysis is extended here to the case where matrices have different row order. Using a definition system in the sense of facet theory, fitting transformations are determined for the set of centroids that represent common substantive equivalence classes of all or some matrices. The resulting operators are used to transform the original matrices. An index, Δ, which is consistent with this approach expresses the goodness of fit.

  • 2 - Defining and Redefining Phenotypes

  • from Part I - Clinical Psychological Science
  • Edited by Aidan G. C. Wright, University of Pittsburgh, Michael N. Hallquist, Pennsylvania State University
  • Book:
    The Cambridge Handbook of Research Methods in Clinical Psychology
    Published online:
    23 March 2020
    Print publication:
    02 April 2020, pp 5-17

  • Summary

    Focusing primarily on descriptive phenotypes for psychopathology, this chapter reviews the history and philosophy of operational definitions, emphasizing their provisional nature under the auspices of open concepts. It also reintroduces an important feature of operational definitions as originally proposed, namely the role of conventions in both defining and redefining the meaning of empirical concepts. It tentatively suggests that a shift toward a scientific realist conception of construct validation had the perhaps unintended consequence of obscuring the intrinsically provisional nature of concepts for psychological phenotypes. It explicates open concepts with the examples of schizophrenia, the five factor model of personality, and endophenotypes.