Psychometric Toolbox
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Psychometric Toolbox

 

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:

  1. Data preprocessor -> descriptive analyses and data transformations.
  2. Guttman scaling -> item analysis and individual scoring based on Guttman's model.
  3. Classical Item Analysis -> CTT-based item analysis and reliability estimation.
  4. Item Factor Analysis -> FA-Based Item Analysis and omega reliability estimation.
  5. Scoring and Norming -> linear and nonlinear score transformations and normative tables.
  6. Item Response Theory-Basic analysis -> item calibration and test scoring based on the one and two parameter logistic models.

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
Antonio Masip Cabrera
David Navarro González
Urbano Lorenzo Seva


Departament de Psicologia
Universitat Rovira i Virgili
Tarragona (Spain)
November, 2016