The Psychometric Toolbox (PT) is a user-friendly, non-commercial package mainly intended to be used for instructional purposes in introductory courses of educational and psychological measurement, psychometrics and statistics. The PT package is organized in six separate modules or sub-programs:
Because they have been designed for instructional use, these modules are intended to (a) be very easy to use, (b) provide clear and well explained results, and (c) make use of graphical displays whenever possible. Apart from its wide scope, the PT is quite versatile and implements features that are not usually found in programs of this type. Thus, the preprocessing module allows the user to replace missing values, perform split-half test partitions, randomly split the sample for cross-validation purposes, perform Jackknife re-sampling, and create automatically parallel forms. The item factor analysis computes the omega coefficient with its confidence intervals and displays one and two canonical solutions in order to detect violations of unidimensionality. The Scoring and Norming program provides confidence intervals for the transformed scores and creates the test normative table based on the user’s specifications.
The program uses Excel modules (one for each sub-program) written in VBA Excel code. So, to run the PT you need to have VBA language installed on your computer. This language is included in Microsoft Office Professional.
Pere Joan Ferrando Piera