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- Newsgroups: sci.cognitive
- Path: sparky!uunet!utcsri!newsflash.concordia.ca!garrot.DMI.USherb.CA!uxa.ecn.bgu.edu!news.ils.nwu.edu!pautler
- From: pautler@ils.nwu.edu (David Pautler)
- Subject: the conjunction effect (was: Logic and stuff)
- Message-ID: <1992Nov18.162252.12357@ils.nwu.edu>
- Sender: usenet@ils.nwu.edu (Mr. usenet)
- Nntp-Posting-Host: aristotle.ils.nwu.edu
- Organization: The Institute for the Learning Sciences
- Date: Wed, 18 Nov 1992 16:22:52 GMT
- Lines: 26
-
- In article <1992Nov18.035416.23721@news2.cis.umn.edu>, frank@i1.msi.umn.edu (Loren Frank) writes:
-
- > On a slightly related topic, when people are given the following
- > scenario :Linda has been very active in social concerns for most
- > of her life. During college she was involved in a number of organizations
- > whose aim was to bolster the rights of the underrepresented.
- > People are then asked "which of the following is more likely:
- > 1) Linda is a bank teller.
- > 2) Linda is a bank teller and active in the feminist movement."
- > People almost always choose 2) even though the likelyhood of a conjunction
- > is always less than the likelyhood of one of the conjuncts.
- >
- > I am not quite sure what that means, but it is true...
-
- Several people have posted possible explanations for this phenomenon (the
- conjunction effect). The findings Loren refers to are from a paper by
- Amos Tversky and Daniel Kahneman titled "Judgements of and by
- representativeness", which appears in their book with Paul Slovic,
- _Judgement under uncertainty_. The authors offer another explanation
- in the book, if folks are interested in following up on this.
-
- If anyone knows of a computational model of Kahneman & Tversky's availability,
- representativeness, and simulation heuristics, I'd like to hear about it.
-
- -dp-
-
-