The test instrument GOALS-2 was designed primarily to evaluate the effectiveness of the CATALST curriculum. The purpose of this study was to perform a psychometric analysis of this instrument. Undergraduate students from six universities in the United States (n=289) were administered the instrument. Three measurement models were fit and compared: the two-parameter logistic model, the mixed model (comprised of both the two-parameter logistic and the graded-response model), and the bi-factor model. The mixed model was found to most appropriately model students' responses. The results suggested the revision of some items and the addition of more discriminating items to improve total test information.
|Number of pages
|Statistics Education Research Journal
|Published - Jan 1 2015
- Item response theory
- Simulation/randomization approaches
- Statistical inference
- Statistics education research