Showing papers by "Jen-Her Wu published in 1993"
TL;DR: An experiment is conducted to test various hypotheses about actual behaviors of people in combining certainties for elemental operators to create an empirical base from which to launch efforts involving the acquisition of knowledge about how specific experts combine certainties at various junctures in inference processes.
1 citations
TL;DR: An experiment compares certainty-combining behaviors versus diverse CFA results for logical, arithmetic and relational operators and shows a significant improvement in the understanding of the psychological validity of certainty factor algebras.
Abstract: Expert system researchers have paid little attention to studying empirically the psychological validity of alternative methods for combining certainty factors. These combining methods, called certainty factor algebras (CFAs), have been organized into a classification framework and a normative mapping has been prescribed to indicate which operators (e.g. AND, OR, +, −, >) should be mapped into each CFA category. However, with the exception of one study concerned solely with the AND operator, there has been no empirical base for assessing the representativeness of the normative mappings. We report on the results of an experiment that compares certainty-combining behaviors versus diverse CFA results for logical, arithmetic and relational operators. This includes a consideration of certainty magnitude and operand magnitude effects. The result is a significant improvement in our understanding of the psychological validity of certainty factor algebras. Such an understanding is important both to knowledge engineers and to the creators of expert system development tools.