Comment on 3PL IRT adjustment for guessing created by Ting-Wei Chiu, Gregory Camilli

By:

Chiu, Ting-Wei [author]

Contributor(s):

Camilli, Gregory [author]

Material type: Text

TextSeries: ; Volume , number ,USA : Sage; 2013Content type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

Online resources:

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Summary: Guessing behavior is an issue discussed widely with regard to multiple choice tests. Its primary effect is on number-correct scores for examinees at lower levels of proficiency. This is a systematic error or bias, which increases observed test scores. Guessing also can inflate random error variance. Correction or adjustment for guessing formulas has been applied to address some of these issues. The purpose of this research comment is to draw attention to the adjustment for guessing implicit in the three-parameter logistic item response theory model. Potential equity issues also arise with respect to this adjustment.

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Holdings
Item type	Current library	Call number	Vol info	Copy number	Status	Notes	Date due	Barcode
Journal Article	Main Library - Special Collections	BF39 APP (Browse shelf(Opens below))	Vol. 37, No. 1 pages 76-86	SP17169	Not for loan	For in-house use only

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Guessing behavior is an issue discussed widely with regard to multiple choice tests. Its primary effect is on number-correct scores for examinees at lower levels of proficiency. This is a systematic error or bias, which increases observed test scores. Guessing also can inflate random error variance. Correction or adjustment for guessing formulas has been applied to address some of these issues. The purpose of this research comment is to draw attention to the adjustment for guessing implicit in the three-parameter logistic item response theory model. Potential equity issues also arise with respect to this adjustment.

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