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Language Testing in Asia

Table 3 Differences in mean item difficulty of VST 1–4 (stacked)

From: Longitudinal measurement of growth in vocabulary size using Rasch-based test equating

Cases

Sum of squares

df

Mean square

F

p

Version

15.827

3

5.276

0.882

0.45

Residuals

3710.102

620

5.984

 
  1. Note. Each VST form contains 156 items, type III sum of squares
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