Interval-level measurement with visual analogue scales in Internet-based research : VAS Generator
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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.
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REIPS, Ulf-Dietrich, Frederik FUNKE, 2008. Interval-level measurement with visual analogue scales in Internet-based research : VAS Generator. In: Behavior Research Methods. 2008, 40(3), pp. 699-704. ISSN 1554-351X. eISSN 1554-3528. Available under: doi: 10.3758/BRM.40.3.699BibTex
@article{Reips2008Inter-28684, year={2008}, doi={10.3758/BRM.40.3.699}, title={Interval-level measurement with visual analogue scales in Internet-based research : VAS Generator}, number={3}, volume={40}, issn={1554-351X}, journal={Behavior Research Methods}, pages={699--704}, author={Reips, Ulf-Dietrich and Funke, Frederik} }
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