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Table 7 1PL item parameter estimates with DIF adjustment (a = 1.7)

From: An item response theory approach to longitudinal analysis with application to summer setback in preschool language/literacy

  Average difficulty Locations
Item b b 4 b 3 b 2 b 1
1 0.79     
2 0.64 see Figure 2  
3 0.94     
4 1.42 −0.35 0.86 2.06 3.11
5 0.71 −1.48 0.10 1.39 2.83
6 1.88 0.18 1.37 2.47 3.49
7 1.92 0.25 1.44 2.50 3.49
8 1.94 0.18 1.39 2.52 3.67
9 1.50 −0.65 0.82 2.28 3.54