skip to main content skip to footer

Use of Jackknifing to Evaluate Effects of Anchor Item Selection on Equating With the Nonequivalent Groups With Anchor Test (NEAT) Design NEAT CE IRT

Author(s):
Lu, Ru; Haberman, Shelby J.; Guo, Hongwen; Liu, Jinghua
Publication Year:
2015
Report Number:
RR-15-10
Source:
ETS Research Report
Document Type:
Report
Page Count:
14
Subject/Key Words:
Resampling (Statistics), Accuracy, Equating, Stability, Non-Equivalent-Groups Anchor Test (NEAT) Design, Chain Equating (CE), Jackknifing, Item Response Theory (IRT)

Abstract

Although the effect of anchor selection does not disappear with increasing sample size, it is reasonable to expect smaller effects with test anchors with more items. To illustrate results, two examples of real equating data were evaluated using two classical equating methods. The results show that rather large effects may be associated with sampling of anchor items.

Read More