Visual Analogue Scale

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A Visual Analogue Scale or VAS is a psychometric response scale which can be used in questionnaires. 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. This continuous (or "analogue") aspect of the scale differentiates it from discrete scales such as the Likert scale.

In practice, computer-analysed VAS responses may be measured using discrete values due to the discrete nature of computer displays.

The VAS can be compared to other linear scales such as the Likert scale or Borg scale. The sensitivity and reproducibility of the results are broadly very similar, although the VAS may outperform the other scales in some cases. [1]

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  1. ^ S. Grant, T. Aitchison, E. Henderson, J. Christie, S. Zare, J. McMurray, and H. Dargie (1999) A comparison of the reproducibility and the sensitivity to change of visual analogue scales, borg scales, and likert scales in normal subjects during submaximal exercise. doi:10.1378/chest.116.5.1208


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