01415nas a2200145   4500008003900000245012900039210006900168300001200237490000700249520089000256100002001146700002301166700002701189856005301216       2007                          d00aComputerized Adaptive Testing for Polytomous Motivation Items: Administration Mode Effects and a Comparison With Short Forms0 aComputerized Adaptive Testing for Polytomous Motivation Items Ad  a412-4290 v313 a<p>In a randomized experiment (n = 515), a computerized and a computerized adaptive test (CAT) are compared. The item pool consists of 24 polytomous motivation items. Although items are carefully selected, calibration data show that Samejima&#39;s graded response model did not fit the data optimally. A simulation study is done to assess possible consequences of model misfit. CAT efficiency was studied by a systematic comparison of the CAT with two types of conventional fixed length short forms, which are created to be good CAT competitors. Results showed no essential administration mode effects. Efficiency analyses show that CAT outperformed the short forms in almost all aspects when results are aggregated along the latent trait scale. The real and the simulated data results are very similar, which indicate that the real data results are not affected by model misfit.</p>
1 aHol, Michiel, A1 aVorst, Harrie, C M1 aMellenbergh, Gideon, J  uhttp://apm.sagepub.com/content/31/5/412.abstract