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ERIC Number: EJ1019183
Record Type: Journal
Publication Date: 2014-Apr
Pages: 9
Abstractor: As Provided
ISSN: ISSN-0013-1644
Effects of Item Parameter Drift on Vertical Scaling with the Nonequivalent Groups with Anchor Test (NEAT) Design
Ye, Meng; Xin, Tao
Educational and Psychological Measurement, v74 n2 p227-235 Apr 2014
The authors explored the effects of drifting common items on vertical scaling within the higher order framework of item parameter drift (IPD). The results showed that if IPD occurred between a pair of test levels, the scaling performance started to deviate from the ideal state, as indicated by bias of scaling. When there were two items drifting with 0.5 logits, IPD could have a substantial effect on vertical scaling. Although IPD had little impact on the recoveries of the parameters on the whole developmental scale, its effects on the recoveries of some parameters by separate grade and grade pair were manifest. Specifically, the mean achievement estimates became worse conditional on the pair of test levels between which IPD occurred, and the estimations of grade-to-grade growth and effect size were distorted for the grade pair corresponding to the test pair that involved IPD. Neither the estimation of standard deviation of the achievement nor the grade-to-grade variability was influenced by IPD.
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Publication Type: Journal Articles; Reports - Research
Education Level: Grade 3; Grade 4; Grade 5; Grade 6; Grade 7; Elementary Education; Secondary Education; Elementary Secondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A