Whenever a selected item does not pass the hurdle, a next item (Step 2) is selected until an item passes the Sympson Hetter probability experiment and it can be administered to the candidate. Many modifications of the Sympson Hetter method have been proposed. For example, Stocking e Lewis (1998) observed that within certain ability groups, the same items were administered even though the Sympson Hetter method was applied. So, even though the overall exposure rate was below,
within certain ranges of ability values, it was high. Therefore they proposed to modify the Sympson Hetter approach and to make it conditional on the ability estimates. In this way, the problem could be dealt with at the costs of even more extensive simulation studies.
Whenever a selected item does not pass the hurdle, a next item (Step 2) is selected until an item passes the Sympson Hetter probability experiment and it can be administered to the candidate. Many modifications of the Sympson Hetter method have been proposed. For example, Stocking e Lewis (1998) observed that within certain ability groups, the same items were administered even though the Sympson Hetter method was applied. So, even though the overall exposure rate was below,within certain ranges of ability values, it was high. Therefore they proposed to modify the Sympson Hetter approach and to make it conditional on the ability estimates. In this way, the problem could be dealt with at the costs of even more extensive simulation studies.
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