Visual Analogue Scale

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

categorization of VAS according to the model of reduced extremes is superior to linear transformation.

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.

The use of visual analog scales (VAS) in survey research has been relatively rare, in part because of operational difficulties. However web surveys permit the use of continuous input devices such as slider bars, making VAS more feasible.

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