Stanine

Stanine (STAndard NINE) is a method of scaling test scores on a nine point standard scale with a mean of 5 and a standard deviation of two.

Some web sources attribute stanines to the U.S. Air Force during during World War II. The earliest known use of Stanines was by the U.S. Air Force in 1943[1] (http://www.avca-sj.org/WINGS32.html).

Test scores are scaled to stanine scores using the following algorithm:

  1. Rank results from lowest to highest
  2. Give the lowest 4% a stanine of 1, the next 7% 2, etc. according to the following table:
Calculating Stanines
Result Ranking4%7%12%17%20%17%12%7%4%
Stanine123456789

Stanines can be used to convert any test score into a single digit number. This was valuable when paper punch cards were the standard method of storing this kind of information but because all stanines are integers two scores in a single stanine are sometimes further apart than two scores in adjacent stanines. This reduces their value.

Today stanines are mostly used in educational assessment[2] (http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2004-45,GGLD:en&q=Stanine).


References

  • Ballew, Pat Origins of some arithmetic terms-2 (http://www.pballew.net/arithme3.html#stanine). Retrieved Dec. 26, 2004.
  • Boydsten, Robert E. (February 27, 2000), Winning My Wings (http://www.avca-sj.org/WINGS32.html)
  • Harcourt Assessment Inc. Harcourt Assessment, Inc. - Resources - Glossary of Terms (http://harcourtassessment.com/hai/Templates/GeneralPurposeTemplate.aspx?NRMODE=Published&NRORIGINALURL=%2fhaiweb%2fCultures%2fen-US%2fResources%2fGlossary%2ehtm&NRNODEGUID=%7bEF521EE7-9004-43C8-A2E1-9AE5CB470063%7d&NRCACHEHINT=NoModifyGuest#stan). Retrieved Dec. 26, 2004

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