01234nas a2200121   4500008004500000245007300045210006900118300001200187490000700199520079700206100001401003856009501017       2011                        Engldsh  00aA Comment on Early Student Blunders on Computer-Based Adaptive Tests0 aComment on Early Student Blunders on ComputerBased Adaptive Test  a165-1740 v353 a<p>This article refutes a recent claim that computer-based tests produce biased scores for very proficient test takers who make mistakes on one or two initial items and that they can be reduced by using a four-parameter IRT model. Because the same effect occurs with pattern scores on nonadaptive tests, the effect results from IRT scoring, not from adaptive testing. Because very proficient test takers rarely err on items of middle difficulty, the so-called bias is one of selective data analysis. Furthermore, the apparently large score penalty for one error on an otherwise perfect response pattern is shown to result from the relative stretching of the IRT scale at very high and very low proficiencies. The recommended use of a four-parameter IRT model is shown to have drawbacks.</p>
1 aGreen, BF  uhttp://mail.iacat.org/content/comment-early-student-blunders-computer-based-adaptive-tests