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Table 1 Performance curves for five mathematical models assessing the use of three and four response categories in the Brazilian Portuguese version of the Olweus Bully/Victim Questionnaire (QBO)

From: Construct validity and reliability of Olweus Bully/Victim Questionnaire – Brazilian version

Modelsa Victim scale Bully scale
Four categories Three categories Four categories Three categories
Generalized Partial Credit Model (GPCM)
a) Discriminating power = 1 94.9 87.1 87.6 77.1
b) Constant discrimination 98.0 94.8 98.2 97.3
c) Variable discrimination 98.6 93.4 98.5 97.8
Graded Response Model (GRM)
d) Constant discrimination 88.0 91.6 85.0 92.2
e) Variable discrimination 86.4 89.7 91.5 94.9
  1. aValues represent the area under the curve in %