Open AccessINFERRING EXAMINEE ABILITY WHEN SOME ITEM RESPONSES ARE MISSING
Author(s) -
Mislevy Robert J.,
Wu PaoKuei
Publication year - 1988
Publication title -
ets research report series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.235
H-Index - 5
ISSN - 2330-8516
DOI - 10.1002/j.2330-8516.1988.tb00304.x
Subject(s) - item response theory , computerized adaptive testing , test (biology) , psychology , differential item functioning , test theory , cognitive psychology , foundation (evidence) , item analysis , statistics , econometrics , computer science , psychometrics , mathematics , developmental psychology , paleontology , history , archaeology , biology
The basic equations of item response theory (IRT) provide a foundation for inferring examinees' abilities and items' operating characteristics from observed responses. In practice, though, examinees will usually not have provided a response to every available item–for reasons that may or may not have been intended by the test administrator, and that may or may not be related to examinee ability. The mechanisms that produce missingness must be taken into account if correct inferences are to be drawn. Using concepts introduced by Rubin (1976), we discuss the implications for ability and item parameter estimation that are entailed by alternate test forms, targeted testing, adaptive testing, time limits, and omitted responses.