Instructors: Dr Maria Pampaka and Prof Julian Williams
Workshop Summary and Content Outline: This 1-day workshop aims to introduce participants to measurement theory and the Rasch model for construction and validation of measures. It covers the basic theory behind measurement, from an Item Response Theory perspective, focusing on the assumptions of the Rasch models, in particular. The Rasch model provides the means to create measures (or score scales) from a combination of items in tests or questionnaires. The principles governing the application of such models are shown through examples from educational measurement but are easily applicable to other areas in social and health sciences. Participants will have the chance to practice with various models of the Rasch family (Dichotomous, Rating Scale and Partial Credit) with specialised software (Winsteps).
The workshop will be of interest to researchers and practitioners involved, among other things, with educational measurement, measurement of satisfaction for evaluation, tests of skills, knowledge and other cognitive outcomes, attitudinal scales, and measures of dispositions.
The workshop will be delivered with a mixture of lectures and practical sessions, around the following themes:
- Introduction to (Rasch) Measurement
- The Dichotomous Rasch Model (with software application)
- The basics of the validation framework with the Rasch Model
- Examples and applications with the Rating Scale Model (which is appropriate for Likert type items) and the Partial Credit Model (which allows for items with different number of response categories to be analysed together).
- Differential Item Functioning, Optimal functioning of rating scales and dimensionality.
Participants should have some basic knowledge of introductory statistics. Some familiarity or previous experience with syntax (commands) in statistical packages will also be useful. Examples of data sets from various contexts will be provided; however, participants might also bring their own datasets and problems to analyse, possibly with a view to preparing a validation report or paper for publication. In order to ensure that the datasets are appropriate for such analyses participants are advised to contact Maria Pampaka (at firstname.lastname@example.org) in advance of the course.
Bond, T.G., and C.M. Fox. 2015. Applying the Rasch model: Fundamental measurement in the human sciences (3rd edition). Routledge.
Pampaka, M., Williams, J.S., Hutchenson, G., Black, L., Davis , P., Hernandez-Martines, P., and Wake, G. 2013. Measuring Alternative Learning Outcomes: Dispositions to Study in Higher Education. Journal of Applied Measurement 14 (2):197-218