ERIC Number: ED204405
Record Type: RIE
Publication Date: 1981-Apr
Reference Count: 0
Comparison of Four Procedures for Equating the Tests of General Educational Development.
Kolen, Michael J.; Whitney, Douglas R.
Procedures used to compare the results from item response theory as well as more traditional equating methods were described and critically analyzed. The implications of the comparison of equipercentile, linear, one-parameter (Rasch), and three-parameter methods for equating twelve forms of each of the five tests of General Educational Development (GED) were discussed. The use of factor analyses to assess test dimensionality, examination of equating curves, examination of item parameter estimates for extremes, comparison of equating sample means and variances, and cross-validation analyses were recommended for use by testing programs contemplating a switch from traditional to item response theory equating. The three-parameter equating method produced unacceptable equating results--possibly because only 200 examinees per equating form were used. The one-parameter (Rasch) method produced results which were as stable as those for the traditional methods. (Author)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers: Cross Validation; Equipercentile Equating; General Educational Development Tests; Linear Equating Method; Rasch Model; Three Parameter Model
Note: Paper presented at the Annual Meeting of the American Educational Research Association (65th, Los Angeles, CA, April 13-17, 1981).