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An IERI – International Educational Research Institute Journal

Table 2 Assignment to the proficiency levels for no item selection and selection with the RMSD cut-off  0.06 and RMSD cut-off 0.08

From: Practical significance of item misfit and its manifestations in constructs assessed in large-scale studies

PL

Cut

All Items

Cut-off = 0.06

Cut-off = 0.08

NLevel (%)

Md

NLevel (%)

Md

Nremain (%)

Ndown (%)

Nup (%)

NLevel (%)

Md

Nremain (%)

Ndown (%)

Nup (%)

1

189

17 (0.95)

393.47

3 (0.16)

398.00

3 (17.65)

14 (82.35)

9 (0.48)

392.90

8 (47.06)

9 (52.94)

2

407

146 (7.83)

457.90

106 (5.63)

458.14

81 (55.48)

65 (44.52)

124 (6.77)

459.06

107 (73.23)

1 (0.68)

38 (26.03)

3

480

539 (28.62)

524.24

526 (27.93)

527.87

410 (76.07)

11 (2.04)

118 (21.89)

498 (26.35)

525.96

429 (79.59)

8 (1.48)

101 (18.91)

4

553

776 (41.16)

587.78

844 (44.82)

588.02

642 (82.73)

50 (6.44)

84 (10.82)

791 (42.01)

589.93

647 (83.38)

30 (3.87)

99 (12.76)

5

626

371 (19.63)

647.84

370 (19.65)

646.86

275 (74.12)

83 (22.37)

13 (3.50)

412 (21.80)

650.90

308 (83.02)

42 (11.32)

21 (5.66)

6

697

34 (1.80)

714.58

34 (1.81)

716.90

19 (55.88)

11 (44.12)

49 (2.59)

718.52

27 (79.41)

7 (20.59)

  1. The results in the columns NLevel and Md are based on PVs, the columns Nremain, Ndown, and Nup on WLE. NLevel = number of persons per proficiency level; Nremain = number of persons who remain on the same proficiency level before and after item selection; Ndown = number of persons who change to a lower proficiency level after item selection; Nup = number of persons who change to a higher proficiency level after item selection; PL = proficiency level