On the logistic midrange

  • E. Olusegun George
  • Cecil C. Rousseau


It is well-known that for a large family of distributions, the sample midrange is asymptotically logistic. In this article, the logistic midrange is closely examined. Its distribution function is derived using Dixon's formula (Bailey (1935,Generalized Hypergeometric Series, Cambridge University Press, p. 13)) for the generalized hypergeometric function with unit argument, together with appropriate techniques for the inversion of (bilateral) Laplace transforms. Several relationships in distribution are established between the midrange and sample median of the logistic and Laplace random variables. Possible applications in testing for outliers are also discussed.

Key words and phrases

Characteristic functions sample median logistic distribution Laplace distribution 


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Copyright information

© The Institute of Statistical Mathematics, Tokyo 1987

Authors and Affiliations

  • E. Olusegun George
    • 1
  • Cecil C. Rousseau
    • 1
  1. 1.Memphis State UniversityUSA

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