ERIC Number: ED377229
Record Type: Non-Journal
Publication Date: 1992-Apr
Reference Count: N/A
Assessing Existing Item Bank Depth for Computer Adaptive Testing.
Bergstrom, Betty A.; Stahl, John A.
This paper reports a method for assessing the adequacy of existing item banks for computer adaptive testing. The method takes into account content specifications, test length, and stopping rules, and can be used to determine if an existing item bank is adequate to administer a computer adaptive test efficiently across differing levels of examinee ability. An example is presented that shows that the adequacy of the bank can depend on the stopping rule implemented. The example is from an item bank with 183 items from 4 content subtests, with 50% of items from subtest 1, 24% from subtest 2, 20% from subtest 3, and 6% from subtest 4. The use of information functions for both subtests and the total test gives a picture of the adequacy of the item bank across content areas. The procedure can be modified for use with other item response theory models as long as the item parameters are known. Ten figures illustrate the discussion. (Contains 13 references.) (Author/SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A