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.

Original languageEnglish
Pages (from-to)105-108
Number of pages4
JournalBehavior genetics
Issue number1
StatePublished - Jan 1988


  • noncentral chi-square
  • power calculation


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