Toward an Understanding of Cross-Cultural Differences in ...

Extremity Index
• Extremity score of a participant:
• Proportion of items with a score at either
extreme (Van Herk et al.: “The relative
number of scores given on the extreme
categories of a rating scale. We counted the
responses in Categories 1 and 5 on the 5-point 5
rating scales”)
• Range:
• from 0 to 1
• Interpretation:
• Values close to 0 denote a low incidence and
values close to 1 denote high incidence of
extremity scoring