A Note on Specifying the Guessing Parameter in ATFIND and DIMTEST created by Alan Socha Christine E. DeMars

By:

Socha, Alan [author]

Contributor(s):

DeMars, Christine E [author]

Material type: Text

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

text

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unmediated

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volume

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Summary: The software program DIMTEST can be used to assess the unidimensionality of item scores. The software allows the user to specify a guessing parameter. Using simulated data, the effects of guessing parameter specification for use with the ATFIND procedure for empirically deriving the Assessment Subtest (AT; that is, a subtest composed of items that potentially measure a second dimension) and DIMTEST for assessing whether that AT represents a second dimension were investigated. Results suggest that specifying higher guessing parameters in ATFIND and DIMTEST result in higher Type I error rates.

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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 87-92	SP17169	Not for loan	For in-house use only

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The software program DIMTEST can be used to assess the unidimensionality of item scores. The software allows the user to specify a guessing parameter. Using simulated data, the effects of guessing parameter specification for use with the ATFIND procedure for empirically deriving the Assessment Subtest (AT; that is, a subtest composed of items that potentially measure a second dimension) and DIMTEST for assessing whether that AT represents a second dimension were investigated. Results suggest that specifying higher guessing parameters in ATFIND and DIMTEST result in higher Type I error rates.

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