Memory & Cognition

, Volume 37, Issue 5, pp 632–643 | Cite as

An encounter frequency account of how experience affects likelihood estimation

  • Natalie A. ObrechtEmail author
  • Gretchen B. Chapman
  • Rochel Gelman


When making judgments, people often favor information received from a few individual sources over largesample statistical data. Individual information is usually acquired piece by piece, whereas statistical information combines many observations into a single summary. We examined whether this difference in the frequency of encounters affects how data are weighted. In two experiments, subjects read statistical information indicating an event to be rare and contrasting information from individual cases suggesting the event to be common. We controlled whether the individual cases were summarized into a single summary like statistical information, or presented serially, case by case. Subjects’ estimates of event frequencies were higher when the individual cases were presented in serial, rather than summarized, format. A third study demonstrated that subjects treat each data sample as an instance, and do not weight according to sample size. These results support the conclusion that people weight information according to encounter frequency.


Individual Information Counter Case Encounter Frequency Percentage Estimate Cognitive Reflection Test 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Psychonomic Society, Inc. 2009

Authors and Affiliations

  • Natalie A. Obrecht
    • 1
    Email author
  • Gretchen B. Chapman
    • 1
  • Rochel Gelman
    • 1
  1. 1.Psychology DepartmentRutgers UniversityPiscataway

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