Cue Utilization in a Numerical Prediction Task
Abstract
Forty subjects were trained to use scatter plots with regression lines to make numerical predictions of one variable (criterion) from another variable (cue). The subjects were trained on two separate cues, differing in validity. Later, the two cues were presented together, simultaneously for 20 subjects, successively for the rest. Subjects were asked to use both cues to predict the criterion. Instructions emphasized that the two cues were independent of one another, but did not specify how the two should be combined. Initial analyses indicated that a regression model provided an adequate fit to the data, that the subjects showed conservatism similar to the conservatism found in previous Bayesian inference studies. However, more molecular analyses indicated patterns of behavior which consistently deviated from the optimal model. The post hoc hypothesis that subjects were regressing each cue, then averaging the regressed values, was supported by the data for most subjects. Searching for heuristic strategies, rather than relying on the apparent fit of optimal models was advocated fur future research.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1974
- Accession Number
- AD0775902
Entities
People
- Paul Slovic
- Sarah Lichtenstein
- Timothy C. Earle
Organizations
- Oregon Research Institute