A comparison of two methods for detecting differential I item functioning in an ESL placement test

Miyuki Sasaki*

*この研究の対応する著者

研究成果: Article査読

24 被引用数 (Scopus)

抄録

This paper compares two approximation techniques for detecting differential item functioning (DIF) in an English as a second language (ESL) placement test when the group sizes are too small to use other possible methods (e.g., the three parameter item response theory method). An application of the Angoff delta- plot method (Angoff and Ford, 1973) utilizing the one parameter Rasch model adopted in Chen and Henning (1985), and Scheuneman's chi-square method (Scheuneman, 1979) were chosen because they are among the few methods appropriate for a sample size smaller than 100. Two linguistically and culturally diverse groups (Chinese and Spanish speaking) served as the subjects of this study. The results reveal that there was only marginal overlap between DIF items detected by Chen and Henning's method and Scheuneman's method; the former detected fewer DIF items with less variety than the latter. Moreover, Chen and Henning's method tended to detect easier items with smaller differ ences in p-value between the two groups whereas Scheuneman's method tended to detect items with the opposite features. Implications of these results are discussed.

本文言語English
ページ(範囲)95-111
ページ数17
ジャーナルLanguage Testing
8
2
DOI
出版ステータスPublished - 1991 12
外部発表はい

ASJC Scopus subject areas

  • 言語および言語学
  • 社会科学(その他)
  • 言語学および言語

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