Uncertainty (H) estimation.

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Abstract
Studied the relationship between uncertainty and estimates of uncertainty. Circular stimuli containing either 2, 4, 8, 16, or 32 colors (each covering a specified segment of the circle) were presented for estimation of their uncertainty, H = -SIGMAp(i) log2 p(i), where p(i) is the proportion of the circle covered by segments of the ith color. For stimuli below 2.8 bits, mean magnitude estimates of uncertainty increased directly with H and were, where expected, significantly different from probability estimates for the same stimuli. For those stimuli above 2.8 bits however, Ss appeared to confuse uncertainty with probability. 20 male and 20 female undergraduates gave both similar uncertainty and similar probability estimates. Results demonstrated that within limits Ss are capable of estimating H. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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