Research Article
Analysis of Variance for Item Differences in Verification Data with Unknown Groups
Table 1
Performance of estimators of for several values of and . The true values are , and negative estimates of are allowed. The RMSEs for =3, =16 agree with that predicted by (6) for merging successive groups, and the RMSEs for =12, = 4 agree with that predicted by (7) for splitting each group into 2 groups.
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