ERIC Number: ED200632
Record Type: Non-Journal
Publication Date: 1981-Apr
Reference Count: N/A
Item Bias, Test Speededness, and Rasch Tests of Fit.
Douglass, James B.
Relationships between item bias, item difficulty invariance, Rasch tests of item fit, and item position in a speeded 72-item Michigan State University Vocabulary Placement Test were investigated using 143 black males, 289 black females, 2,953 white males and 3,271 white females. Measures of item bias and item difficulty invariance were determined and compared for the one-parameter logistic item-response model using the BICAL and LOGIST computer programs. The emphasis was not upon detection of bias, but rather upon the effects of bias. The BICAL program scores as incorrect those items omitted or not reached by an examinee. The LOGIST program treats item responses differently depending upon whether an item is considered to be correctly answered, incorrectly answered, omitted or not reached. In this study, the BICAL estimates were found to be subject to ethnic bias due to test speededness; this effect was not present in the LOGIST estimates. Item difficulty invariance was related to several Rasch tests of fit for the BICAL estimates. (Author/RL)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Sponsor: Michigan State Univ., East Lansing.; Educational Testing Service, Princeton, NJ.
Authoring Institution: N/A