Regression programs using summary data

Programs: Regbuild.exe and Regbuild_t.exe

These programs for PCs accompany the paper: Crawford, J. R. & Garthwaite, P.H. (2007). Using regression equations built from summary data in the neuropsychological assessment of the individual case”.  Neuropsychology, 21, 611-620.

There is a wealth of data that could be used to build regression equations for use in neuropsychology, in turn these equations could be used to draw inferences concerning single-cases. The aim of these programs and accompanying paper is to help provide access to such data. For example, there are numerous studies reporting the test-retest correlation between neuropsychological tests, as the means and SDs at test and retest are usually also reported, these summary statistics can be used to build an equation to test for change in a single-case's test performance

The programs and paper are an extension of Crawford & Garthwaite's (2006) and Crawford & Howell's (1998) work on the use of regression in the individual case (click here for details). Unlike the programs regdiscl.exe and regdisclv.exe, the above programs do not require that the user has access to an existing regression equation. The program regbuild.exe builds the regression equation for the user from summary data (the correlation between the predictor and criterion variables and their means and SDs). Having built the equation, the program then permits the user to compare an individual's predicted score with the individual's obtained score. That is, it provides a signficance test on the discrepancy between the predicted and obtained score. It also provides a point estimate of the abnormality of the discrepancy (i.e., a point estimate of the percentage of the population exhibiting a larger discrepancy) and accompanying confidence limits on this quantitiy.

Even when the correlation between predictor and criterion is not available it will still often be possible to build an equation from summary statistics - the correlation can be "recovered" if a study reports the results of a paired t-test or ANOVA comparing predictor and criterion variables. The program regbuild_t.exe performs the same tasks as the main program (regbuild.exe) but is used in this latter situation.

The program regbuild.exe builds a regression equation from summary statistics and applies it to an individual's data.  Click here to download the program (462Kb).

The program regbuild_t.exe is a companion program for regbuild.exe. and can be used to build an equation when the correlation between predictor and criterion variable is not reported; the program requires a t value from a paired samples t-test (or ANOVA equivalent).  Click here to download the program (463Kb).

Alternatively both files can be downloaded as a zip file (465 Kb); click here.

Your web browser is most probably configured to recognise that the files are executable. If you have any problems (i.e. the browser treats them as text files), hold down the shift key when clicking. If your network does not allow downloads of executables then downloading the zip file is a solution.

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.

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