1. What is the difference between the reliability and validity of a measurement? The validity of a measure is the extent to which differences in scores on the instrument reflect true differences among ...

Background: Disease-specific Quality Of Life (QOL) measures are devised to assess the impact of a specific disease across a spectrum of important domains of life. The purpose of this study was to ...

Objective: To evaluate construct validity and scoring methods of the world health organization—health and work performance questionnaire (HPQ) for people with arthritis. Methods: Construct validity ...

This article focuses on the analytical competence of teachers, which can be defined as the ability to properly perceive and assess lessons in terms of the effectiveness of pupils’ learning. However, ...

Convergent validity examines the extent to which the outcome of interest agrees with the result of another measure that is believed to be assessing the same attribute. The cross-sectional convergent ...