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Interval level measurement with visual analogue scales in Internet-based research: VAS Generator


Reips, U D; Funke, F (2008). Interval level measurement with visual analogue scales in Internet-based research: VAS Generator. Behavior Research Methods, 40(3):699-704.

Abstract

The present article describes VAS Generator (www.vasgenerator.net), a free Web service for creating a wide range of visual analogue scales that can be used as measurement devices in Web surveys and Web experimenta-
tion, as well as for local computerized assessment. A step-by-step example for creating and implementing a vi-
sual analogue scale with visual feedback is given. VAS Generator and the scales it generates work independently
of platforms and use the underlying languages HTML and JavaScript. Results from a validation study with 355
participants are reported and show that the scales generated with VAS Generator approximate an interval-scale
level. In light of previous research on visual analogue versus categorical (e.g., radio button) scales in Internet-
based research, we conclude that categorical scales only reach ordinal-scale level, and thus visual analogue
scales are to be preferred whenever possible.

The present article describes VAS Generator (www.vasgenerator.net), a free Web service for creating a wide range of visual analogue scales that can be used as measurement devices in Web surveys and Web experimenta-
tion, as well as for local computerized assessment. A step-by-step example for creating and implementing a vi-
sual analogue scale with visual feedback is given. VAS Generator and the scales it generates work independently
of platforms and use the underlying languages HTML and JavaScript. Results from a validation study with 355
participants are reported and show that the scales generated with VAS Generator approximate an interval-scale
level. In light of previous research on visual analogue versus categorical (e.g., radio button) scales in Internet-
based research, we conclude that categorical scales only reach ordinal-scale level, and thus visual analogue
scales are to be preferred whenever possible.

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60 citations in Web of Science®
77 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:06 Faculty of Arts > Institute of Psychology
Dewey Decimal Classification:150 Psychology
Language:English
Date:August 2008
Deposited On:05 Dec 2008 11:23
Last Modified:05 Apr 2016 12:31
Publisher:Psychonomic Society
ISSN:1554-351X
Publisher DOI:10.3758/BRM.40.3.699
Permanent URL: http://doi.org/10.5167/uzh-4565

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