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A note on computing the chi-square noncentrality parameter for power analyses

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Abstract

Power calculations for a variety of research designs used in behavior genetics require the determination of a chi-square noncentrality parameter. For many purposes published tables are adequate, but for cases where they are not we provide a graph for approximating the required parameters for up to 300 degrees of freedom and illustrate a straightforward procedure for accurate determination using a widely available SAS function.

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Authors and Affiliations

  1. Department of Human Genetics, Medical College of Virginia, 23298-0001, Richmond, Virginia

    J. K. Hewitt & A. C. Heath

Authors
  1. J. K. Hewitt
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  2. A. C. Heath
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Additional information

This work was supported in part by Grants AG04954, MH40828, GM30250, and AA06781 from the National Institutes of Health.

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Hewitt, J.K., Heath, A.C. A note on computing the chi-square noncentrality parameter for power analyses. Behav Genet 18, 105–108 (1988). https://doi.org/10.1007/BF01067079

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  • DOI: https://doi.org/10.1007/BF01067079

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