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((More citations needed|date=January 2021))
A '''choice set''' is a finite collection of available options selected from a larger theoretical decision space. For example, a consumer has thousands of conceivable alternatives when purchasing a car, far more than they could reasonably be expected to evaluate. As such they will often narrow their search to only vehicles of a certain make, or within a specific price range. By reducing the choice set to a manageable number of alternatives, people are able to make complex decisions between theoretically infinite alternatives in a practical time frame. Choice sets are often used in psychological and market research to make data collection and evaluation more manageable, or to make direct comparisons between a specific set of choices.<ref>((Cite journal|last=Thill|first=Jean-Claude|date=1992-09-01|title=Choice set formation for destination choice modelling|journal=Progress in Human Geography|language=en|volume=16|issue=3|pages=361–382|doi=10.1177/030913259201600303|s2cid=144050072|issn=0309-1325))</ref>

==Choice task==
The respondent is asked a choice task. Usually this is which of the alternatives they prefer. In this example, the Choice task is '[[2AFC|forced]]'. An 'unforced' choice would allow the respondents to also select 'Neither'.
The choice task is used as the [[dependent variable]] in the resulting [[choice modelling|choice model]].

== Example of a choice set ==
[[Image:example choice set (en).png|thumb|Example produced using [[SurveyEngine]]]]

A choice set has the following elements:
*'''Alternatives''': A number of hypothetical alternatives, Car A and Car B in this example. There may be one or more Alternatives including the 'None' Alternative.
*'''Attributes ''': The attributes of the alternatives ideally are mutually exclusive and independent. When this is not possible, attributes are nested.
*'''Levels''': Each Attribute has a number of possible levels that the attributes may range over. The specific levels that are shown are driven by an [[experimental design]]. Levels are discrete, even in the case that the attribute is a scalar such as price. In this case, the levels are discretized evenly along the range of allowable values.

==References==
((reflist))

[[Category:Choice modelling]]
[[Category:Design of experiments]]

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