Ke. Green et Rc. Kluever, CLARIFICATION OF THE EFFECT OF ROTATION AND REFLECTION ON THE DIFFICULTY OF MATRICES ITEMS, Perceptual and motor skills, 85(1), 1997, pp. 105-106
Experimental matrices items were constructed to isolate the effect of
option rotation and reflection on item difficulty. Results for 91 firs
t to fifth graders showed no significant difference in difficulty for
the two test forms and neither rotation nor reflection predicted item
difficulty. The strongest predictor of item difficulty was number of t
ask dimensions.