The Statistical Sign Test Author(s): W. J. Dixon and A. M. Mood Reviewed work(s): Source: Journal of the American Statistical Association, Vol. 41, No. 236 (Dec., 1946), pp. 557- 566 Published by: American Statistical Association Stable URL: http://www.jstor.org/stable/2280577 . Accessed: 19/02/2013 17:39 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact
[email protected]. American Statistical Association is collaborating with JSTOR to digitize, preserve and extend access to Journal of the American Statistical Association. http://www.jstor.org This content downloaded on Tue, 19 Feb 2013 17:39:22 PM All use subject to JSTOR Terms and Conditions THE STATISTICAL SIGN TEST* W. J. DIXON Universityof Oregon A. M. MOOD Iowa State College This paper presentsand illustratesa simplestatistical test forjudging whether one of two materialsor treatmentsis bet- terthan the other.The data to whichthe test is applied consist of paired observationson the two materials or treatments. The test is based on the signs of the differencesbetween the pairs of observations. It is immaterialwhether all the pairs of observationsare comparableor not. However,when all the pairs are compar- able, there are more efficienttests (the t test, for example) whichtake account of the magnitudesas well the signsof the differences.Even in this case, the simplicityof the sign test makes it a usefultool fora quick preliminaryappraisal of the data.