A simple test of the Law of Initial Values

Authors

  • RINIE GEENEN,

    1. Rheumatology Department, University Hospital, Utrecht, The Netherlands
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    • Address reprint requests to: R. Geenen, Rheumatology Department, University Hospital, P.O. Box 85500, 3508 GA Utrecht, The Netherlands.

  • FONS J. R. VAN DE VIJVER

    1. Department of Social Sciences, Tilburg University, Tilburg, The Netherlands
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Abstract

The conceptualization and testing of the Law of Initial Values remains a controversial issue. We critically review common procedures to test the Law, and a simple test of the Law is described and illustrated. The reduction of variance from the pretest to the posttest is crucial in this test.

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