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Reference.org
Visual analogue scale
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<p>The visual analogue scale (VAS) is a <a href="/facts/Psychometrics/56X26MDI">psychometric</a> response scale that can be used in <a href="/facts/Questionnaire/15o4lgqm">questionnaires</a>. It is a measurement instrument for subjective characteristics or attitudes that cannot be directly measured. When responding to a VAS item, respondents specify their level of agreement to a statement by indicating a position along a continuous line between two end points. </p>