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. Author manuscript; available in PMC: 2014 Sep 18.
Published in final edited form as: Med Care. 2011 May;49(5):461–468. doi: 10.1097/MLR.0b013e318207edb5

Table 3.

Anchor item identification. P-values of step by step permutation tests

Round 1 P-values Round 2 P-values Round 3 P-values
Item a b1 b2 a b1 b2 a b1 b2
1 0.82 0.74 0.44 0.39 0.27 0.82 0.35 0.24 0.80
2 0.84 0.00 0.72
3 0.36 0.89 0.07 0.12 0.84 0.04
4 0.50 0.73 0.66 0.85 0.77 0.96 0.77 0.71 0.96
5 0.81 0.14 0.05
6 0.06 0.03 0.00
7 0.36 0.99 0.06 0.44 0.13 0.64 0.46 0.12 0.69
8 0.05 0.92 0.43 0.31 0.22 0.96 0.27 0.21 0.90
9 0.44 0.28 0.01

Note: In the IRT graded response model used, a is the discrimination parameter and b1 and b2 are the item difficulty or location parameters.