, Volume 44, Issue 3, pp 351–355 | Cite as

On the base-free measure of change proposed by Tucker, Damarin and Messick

  • Lloyd Bond
Notes And Comments


Tucker, Damarin and Messick proposed a “base-free” measure of change which involves the computation of residual scores that are uncorrelated with true scores on the pretest. The present note discusses this change measure and demonstrates that, because of an incorrect derivation by the authors, properties they attribute toα (the coefficient for the regression of true scores from the second testing on true scores from the first testing) are, in fact, properties ofb, the ordinary regression coefficient. A correct derivation of the initial position—change correlation in terms ofα is obtained, and Tucker et al.'s discussion of the “law of initial values” is reconsidered.

Key words

base-free measure of change difference scores measuring change 


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Copyright information

© The Psychometric Society 1979

Authors and Affiliations

  • Lloyd Bond
    • 1
  1. 1.Department of PsychologyUniversity of PittsburghPittsburgh

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