Validity and reliability in quantitative studies

Validity and reliability in quantitative studiesRoberta Heale,1 Alison Twycross2 Evidence-based practice includes, in part, implementa-tion of thefindings of well-conducted quality researchstudies. So being able to critique quantitative research isan important skill for nurses. Consideration must begiven not only to the results of the study but also therigourof the research. Rigour refers to the extent towhich the researchers worked to enhance the quality ofthe studies . In quantitative research, this is achievedthrough measurement of the Validity and defined as the extent to which a concept isaccurately measured in a quantitative study.

2 Divergent validity—shows that an instrument is poorly correlated to instruments that measure differ-ent variables. In this case, for example, there should be a low correlation between an instrument that mea-sures motivation and one that measures self-efficacy. 3 Predictive validity—means that the instrument

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  Reliability, Validity, Predictive, Predictive validity

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