Ambiguous decision situations are characterized as having probabilities that are uncertain. The uncertainty is due to the common, real-world deficiency of information about the process by which the outcomes are determined. Thirty lotteries having uncertain probabilities were constructed by varying the centers and the ranges of the intervals within which the imprecise probabilities of winning could lie. Pairs of the lotteries were presented as choice alternatives to subjects, with each pair having lotteries with the same interval center but differing interval ranges. Ambiguity avoidance, the selection of the less ambiguous option, was found to increase with the interval center C, with ambiguity indifference occurring for values of C ≤ 0.40. No evidence of ambiguity seeking as the prevalent behavior was obtained. Ambiguity avoidance did not significantly increase with the interval range R, but an interaction effect between C and the ranges R1 and R2 of the choice pair was obtained. This effect of the ranges could not be described simply by knowledge of the difference R1 - R2; knowledge of both individual values was necessary. The theoretical implications of these results are discussed.
|Original language||English (US)|
|Number of pages||15|
|Journal||Organizational Behavior and Human Decision Processes|
|State||Published - Oct 1985|
Bibliographical noteFunding Information:
This research was supported by National Institute of Mental MH16892. Send reprint requests to Shawn P. Curley, 205E Perry Psychology, University of Michigan, Ann Arbor, MI 48109.