- Stanine
Stanine (STAndard NINE) is a method of scaling test scores on a nine-point standard scale with a mean of five (5) and a standard deviation of two (2).
Some web sources attribute stanines to the U.S. Army Air Forces during
World War II . The earliest known use of Stanines was by the U.S. Army Air Forces in 1943 [http://www.avca-sj.org/WINGS32.html] .Test scores are scaled to stanine scores using the following algorithm:
# Rank results from lowest to highest
# Give the lowest 4% a stanine of 1, the next 7% a stanine of 2, etc., according to the following table:Calculating Stanines Result Ranking 4% 7% 12% 17% 20% 17% 12% 7% 4% Stanine 1 2 3 4 5 6 7 8 9 The underlying basis for obtaining stanines is that a
normal distribution is divided into nine intervals, each of which has a width of one half of a standard deviation excluding the first and last. The mean lies approximately in the centre of the fifth interval.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. However, 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 [http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2004-45,GGLD:en&q=Stanine] . The
University of Alberta inEdmonton ,Canada used the stanine system until2003 , when it switched to a 4-point scale [http://www.registrar.ualberta.ca/ro.cfm?id=184] .ee also
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Normal score References
* Ballew, Pat [http://www.pballew.net/arithme3.html#stanine Origins of some arithmetic terms-2] . Retrieved Dec. 26, 2004.
* Boydsten, Robert E. (February 27, 2000), [http://www.avca-sj.org/WINGS32.html Winning My Wings]
* Harcourt Assessment Inc. [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 Harcourt Assessment, Inc. - Resources - Glossary of Terms] . Retrieved Dec. 26, 2004
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