Psychology: Research and Review
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 |