The standard procedure of quantifying ambivalence is to combine estimates of positive and negative attitude components into a numerical index. Several authors developed formulae for this purpose. However, the empirical validity of these measures is under-explored. This study is intended to partly fill this gap and compares the discriminative validity of common ambivalence formulae and one direct measure of ambivalence. One-hundred German students rated their positive and negative evaluations and their ambivalence toward a fictitious person. Discriminative validity was assessed by comparing each measures' scores across five experimental conditions assumed to elicit different levels of ambivalence. The results provide evidence for some discriminative validity of all ambivalence indices, with total effect sizes (% variance attributable to the experimental treatments) ranging from .12 to .21.
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