UniODA vs. Chi-Square: Discriminating Inhibited and Uninhibited Infant Profiles

Paul R. Yarnold

Optimal Data Analysis, LLC

Kagan and Snidman investigated processes mediating early reactivity to stimulation in a longitudinal study of 94 four-month-old infants who displayed a combination of either high motor activity and frequent crying, or low motor activity and infrequent crying. Fearful behavior assessed at 9 and 14 months of age was examined in relation to these two infant typologies. Eyeball analysis, which was confirmed statistically using chi-square analysis, revealed that 40% of low motor activity infants displayed “low fear” (which was arbitrarily defined as one or fewer fears) at both 9 and 14 months, versus 0% of high motor activity infants. When UniODA was applied to these data it identified statistically reliable effects at 9- and 14-months: the strongest effect occurred at 14 months. Applying CTA to these data revealed that a multiattribute model wasn’t feasible.

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