, Volume 12, Issue 2, pp 141–152 | Cite as

Table of mean deviates for various portions of the unit normal distribution

  • Hollis M. Leverett


In the absence of sound units of measurement, the data obtained by use of a psychometric instrument may sometimes be so irregular that they cannot be accepted as a good representation of the true function of the trait measured. Frequently, ordered categorical or ranked data and other irregular distributions are obtained to represent traits that are obviously continuous and probably unskewed functions. In such cases, the data may be improved in the direction of a better approximation of the true function by converting them to normal distribution form. A table of mean deviates of various portions of the unit normal curve is presented to facilitate this conversion.


Normal Distribution Public Policy Statistical Theory Good Representation Normal Curve 
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    Kelley, Truman L. Statistical method. New York: Macmillan, 1923.Google Scholar
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    Kelley, Truman L. The Kelley statistical tables. New York: Macmillan, 1938.Google Scholar
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    Thorndike, Edward L. Introduction to the theory of mental and social measurements. New York: Teachers College, Columbia University, 1913.Google Scholar

Copyright information

© Psychometric Society 1947

Authors and Affiliations

  • Hollis M. Leverett
    • 1
  1. 1.Harvard UniversityUSA

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