Interval-level measurement with visual analogue scales in Internet-based research: VAS Generator.
- 2008-08-14
Published in:
- Behavior research methods. - 2008
English
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 experimentation, as well as for local computerized assessment. A step-by-step example for creating and implementing a visual 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.
- Language
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- English
- Open access status
- bronze
- Identifiers
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- DOI 10.3758/brm.40.3.699
- PMID 18697664
- Persistent URL
- https://folia.unifr.ch/global/documents/146841
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