This PC program (pairabno.exe) accompanies the paper Crawford, J.R., Howell, D. C., & Garthwaite, P.H. (1998). Payne and Jones revisited: Estimating the abnormality of test score differences using a modified paired samples t-test. Journal of Clinical and Experimental Neuropsychology, 20, 898-905.

NOTE: please feel free to download this program. However, you should be aware that it has now been superceded by another program: RSDT.exe. This updated version has a number of advantages: (1) It achieves of the Type I error rate regardless of the correlation between the two tasks and regardless of the size of the control or normative sample, (2) it is a full Windows GUI program, and (3) it allows the user to save or print the results. Click here for further details.

A web page describing single-case methods and their rationale in cogntive neuropsychology is available here

A web page which gathers together all our computer programs for use in single-case research in cognitive neuropsychology is available here

Click here to download the original program (pairabno.exe). Your web browser is most probably configured to recognise that the file as an executable. If you encounter any problems (i.e. the browser treats it as a text file), try holding down the shift key when clicking.

Once downloaded, the program can be run by any of the normal Windows procedures i.e., by clicking on file in file manager, by using Windows start menu, 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.