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    • A note on testing the sphericity hypothesis with Bartlett's test 

      Reddon, John R.; Jackson, Douglas N. (Douglas Northrop), 1929-2004 (Wichita State University, Department of Psychology, 1984)
      This study employs computer simulations of correlations matrices to evaluate sample size requirements with different numbers of variables for testing departures from sphericity, implying the presence of group factors. ...