Program: IIMA.EXE

This computer program (IIMA.EXE) accompanies the paper: Crawford, J. R., Garthwaite, P. H, Howell, D. C., & Venneri, A. (2003). Intra-individual measures of association in neuropsychology: Inferential methods for comparing a single case with a control or normative sample".  Journal of the International Neuropsychological Society, 989-1000. (click here for pdf)

In single-case studies and in clinical practice some constructs are quantified not by a conventional score (such as number of items correct) but as an intra-individual measure of association (i.e., a correlation coefficient).  Examples include quantifying temporal order memory by calculating the correlation between the order material was presented and a person’s memory for that order, or quantifying an individual’s tone perception etc. The computer program is designed to allow single-case researchers or clinicians to test whether the correlation (parametric or non-parametric) obtained from a patient is significantly different from those of a control sample. It also provides a point estimate of the abnormality of the patients score; i.e., it estimates the percentage of the control population that would obtain a more extreme correlation and provides a 95% confidence interval for this percentage. ( A related program singslope.exe for testing if the slope of a case's regression line differs from the slopes of controls is also available).

Click here to download the program (463Kb). A zipped version is also available.

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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.

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