, Volume 22, Issue 3, pp 207–220 | Cite as

A significance test for the hypothesis that two variables measure the same trait except for errors of measurement

  • Frederic M. Lord


The likelihood-ratio significance test is derived for the hypothesis that after correction for attenuation two variables have a perfect correlation in the population from which the sample is drawn.


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Copyright information

© Psychometric Society 1957

Authors and Affiliations

  • Frederic M. Lord
    • 1
  1. 1.Educational Testing ServiceUSA

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