Abstract
We assessed students’ modelling competency using a test consisting of different classes of items. Within the first class there are items which cover the whole modelling process, whereas items of the second class focus only on certain parts of this process. To cope with the requirements of the two different classes of items we used a multidimensional Rasch model including subdimensions. In this chapter we describe the structure of the test instrument and compare the subdimensional scaling of the test results with a unidimensional one. The analyses show the superiority of the subdimensional scaling.
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According to Rost (2004, S. 381) the reliability is estimated as follows: \( rel\text{=}\frac{{\hat{\sigma}}_{\theta}^{2}}{\nu ar\hat{\theta}} \), with \( {\hat{\sigma}}_{\theta}^{2} \) as variance of the latent distribution and \( \nu ar\hat{\theta} \) as variance of the estimated person parameters.
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Zöttl, L., Ufer, S., Reiss, K. (2011). Assessing Modelling Competencies Using a Multidimensional IRT Approach. In: Kaiser, G., Blum, W., Borromeo Ferri, R., Stillman, G. (eds) Trends in Teaching and Learning of Mathematical Modelling. International Perspectives on the Teaching and Learning of Mathematical Modelling, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0910-2_42
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