“…Unfortunately, while many a priori or empirically based typologies of affective response (moods, emotions, drives, and other feelings) exist in the literature (e.g., Izard 1977;Osgood 1966), no formal evidence has appeared to establish the validity of the categories of affective response suggested by prior studies. Like other cluster-analytic work, recent studies such as Aaker, Stayman, & Vezina (1988) have identified clusters of feeling adjectives. However, after the extraction of such clusters, it is essential then to perform formal tests of convergent and discriminant validity on the resulting clusters, because the number of clusters and the specification of cluster boundaries are usually arbitrary (Cattell, 1978, p. 45).…”