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Educational and Psychological Measurement
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Article

Tetrachoric Correlation: A Permutation Alternative

Michael A. Long*, Kenneth J. Berry, and Paul W. Mielke Jr.

Colorado State University

* To whom correspondence should be addressed. E-mail: Michael.Long{at}colostate.edu.


  Abstract
An exact permutation test is provided for the tetrachoric correlation coefficient. Comparisons with the conventional test employing Student’s t distribution demonstrate the necessity of using the permutation approach for small sample sizes and/or disproportionate marginal frequency totals.

First published on October 15, 2008, doi:10.1177/0013164408324463

Educational and Psychological Measurement 2009;69:429.

A more recent version of this article appeared on June 1, 2009

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