# 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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### Disclaimer:

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 j.crawford@abdn.ac.uk. Further contact
details are available in the footer of this page.