A program that calculates the Mahalanobis Distance Index of the abnormality of an individual's subtest scatter on the WAIS-R. The method was developed by Burgess (1991). The current version can only be used with a full-length WAIS-R; I may get round to modifying it for use with short-forms. To download click here.

For essential background details on the psychometric methods implemented in the program see the following papers:

Burgess, A. (1991). Profile analysis of the Wechsler Intelligence Scales: a new index of subtest scatter. British Journal of Clinical Psychology, 30, 257-263.

Crawford, J. R. & Allan, K. M. (1994). The Mahalanobis distance index of WAIS-R subtest scatter: psychometric properties in a healthy UK sample. British Journal of Clinical Psychology, 33, 65-69.

reprint as pdf

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Once downloaded, the programs can be run by any of the normal Windows procedures i.e. by clicking on file in File Manager or by placing on desktop etc.

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The author of this software (John R Crawford) and the University of Aberdeen make no representations about the suitability of the software or about any content or information made accessible by the software, for any purpose.

The software is provided 'as is' without express or implied warranties, including warranties of merchantability and fitness for a particular purpose or noninfringement.

The software is provided gratuitously and, accordingly, the author shall not be liable under any theory or any damages suffered by you or any user of the software.

If there are any problems please e-mail me at Further contact details are available in the footer of this page.