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ERIC Number: EJ1110914
Record Type: Journal
Publication Date: 2004-Mar
Pages: 23
Abstractor: As Provided
ISSN: EISSN-2330-8516
A Graphical Approach to Item Analysis. Research Report. ETS RR-04-10
Livingston, Samuel A.; Dorans, Neil J.
ETS Research Report Series, Mar 2004
This paper describes an approach to item analysis that is based on the estimation of a set of response curves for each item. The response curves show, at a glance, the difficulty and the discriminating power of the item and the popularity of each distractor, at any level of the criterion variable (e.g., total score). The curves are estimated by Gaussian kernel smoothing, a weighted moving average process with a parameter that can be varied at the user's discretion. The response curve for the correct answer can be accompanied by curves indicating a confidence region. The response curves also form the basis for estimating item statistics for any group of examinees for which the distribution of the criterion variable is known.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A