Differential item functioning in the Peabody Picture Vocabulary Test - Third Edition: partial correlation versus expert judgment

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Title: Differential item functioning in the Peabody Picture Vocabulary Test - Third Edition: partial correlation versus expert judgment
Author: Conoley, Colleen Adele
Abstract: This study had three purposes : (1 ) to identify differential item functioning (DIF ) on the PPVT -III (Forms A & B ) using a partial correlation method , (2 ) to find a consistent pattern in items identified as underestimating ability in each ethnic minority group , and (3 ) to compare findings from an expert judgment method and a partial correlation method . Hispanic , African American , and white subjects for the study were provided by American Guidance Service (AGS ) from the standardization sample of the PPVT -III ; English language learners (ELL ) of Mexican descent were recruited from school districts in Central and South Texas . Content raters were all self -selected volunteers , each had advanced degrees , a career in education , and no special expertise of ELL or ethnic minorities . Two groups of teachers participated as judges for this study . The "expert" group was selected because of their special knowledge of ELL students of Mexican descent . The control group was all regular education teachers with limited exposure to ELL . Using the partial correlation method , DIF was detected within each group comparison . In all cases except with the ELL on form A of the PPVT -III , there were no significant differences in numbers of items found to have significant positive correlations versus significant negative correlations . On form A , the ELL group comparison indicated more items with negative correlation than positive correlation [ ?2 (1 ) = 5 .538 ; p= .019] . Among the items flagged as underestimating ability of the ELL group , no consistent trend could be detected . Also , it was found that none of the expert judges could adequately predict those items that would underestimate ability for the ELL group , despite expertise . Discussion includes possible consequences of item placement and recommendations regarding further research and use of the PPVT -III .
URI: http : / /hdl .handle .net /1969 .1 /151
Date: 2004-09-30

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Differential item functioning in the Peabody Picture Vocabulary Test - Third Edition: partial correlation versus expert judgment. Available electronically from http : / /hdl .handle .net /1969 .1 /151 .

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