What Is Reliability And Validity In Research Pdf

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Validity and reliability are two important factors to consider when developing and testing any instrument e. Attention to these considerations helps to insure the quality of your measurement and of the data collected for your study.

By Saul McLeod , published The term reliability in psychological research refers to the consistency of a research study or measuring test. For example, if a person weighs themselves during the course of a day they would expect to see a similar reading. Scales which measured weight differently each time would be of little use. The same analogy could be applied to a tape measure which measures inches differently each time it was used.

Reliability and Validity

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Introduction Across disciplines, competent researchers often not only fail to report the reliability of their measures Henson, ; Thompson, , but also fall short of grasping the inextricable link between scale validity and effective research.

At worst, measurement error can significantly damage the interpretability of scores or the function of a testing instrument. Save to Library. Create Alert. Launch Research Feed. Share This Paper. Background Citations. Methods Citations. Results Citations. Citation Type. Has PDF. Publication Type. More Filters. View 1 excerpt, cites background. Research Feed. Highly Influenced.

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Highly Influential. View 7 excerpts, references background. Scale Development: Theory and Applications. View 6 excerpts, references background and methods. View 3 excerpts, references background. Introduction to Classical and Modern Test Theory.

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Validity, reliability, and generalizability in qualitative research

Once the outline of a survey instrument has been developed and specific questions are in place, the next step is to validate the instrument and its measurements. This is arguably a more complex task in the social and behavioral sciences than in many of the biological and physical sciences, as social science concepts are often abstract, intangible, or otherwise not easily observed. Nevertheless, in order for survey research measurements to be accurate, they must be precise and stable. Validity and reliability are closely related research concepts. Show page numbers Download PDF.

Issues of research reliability and validity need to be addressed in methodology chapter in a concise manner. Reliability refers to the extent to which the same answers can be obtained using the same instruments more than one time. In simple terms, if your research is associated with high levels of reliability, then other researchers need to be able to generate the same results, using the same research methods under similar conditions. According to Wilson reliability issues are most of the time closely associated with subjectivity and once a researcher adopts a subjective approach towards the study, then the level of reliability of the work is going to be compromised. Validity of research can be explained as an extent at which requirements of scientific research method have been followed during the process of generating research findings. Oliver considers validity to be a compulsory requirement for all types of studies. There are different forms of research validity and main ones are specified by Cohen et al as content validity, criterion-related validity, construct validity, internal validity, external validity, concurrent validity and face validity.

How to Determine the Validity and Reliability of an Instrument

Published on July 3, by Fiona Middleton. Revised on June 26, Reliability and validity are concepts used to evaluate the quality of research. They indicate how well a method , technique or test measures something. Reliability is about the consistency of a measure, and validity is about the accuracy of a measure.

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Introduction Across disciplines, competent researchers often not only fail to report the reliability of their measures Henson, ; Thompson, , but also fall short of grasping the inextricable link between scale validity and effective research.

Instrument is the general term that researchers use for a measurement device survey, test, questionnaire, etc. To help distinguish between instrument and instrumentation, consider that the instrument is the device and instrumentation is the course of action the process of developing, testing, and using the device. Instruments fall into two broad categories, researcher-completed and subject-completed, distinguished by those instruments that researchers administer versus those that are completed by participants. Researchers chose which type of instrument, or instruments, to use based on the research question. Examples are listed below:.

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What is Reliability?
2 Response
  1. DorothГ©e D.

    In general practice, qualitative research contributes as significantly as quantitative research, in particular regarding psycho-social aspects of patient-care, health services provision, policy setting, and health administrations.

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