File Name: definition of reliability and validity in research .zip
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.
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.
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.
By Dr. Saul McLeod , published The concept of validity was formulated by Kelly , p. For example a test of intelligence should measure intelligence and not something else such as memory. A distinction can be made between internal and external validity. Internal validity refers to whether the effects observed in a study are due to the manipulation of the independent variable and not some other factor.
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. In contrast to quantitative research, qualitative research as a whole has been constantly critiqued, if not disparaged, by the lack of consensus for assessing its quality and robustness. This article illustrates with five published studies how qualitative research can impact and reshape the discipline of primary care, spiraling out from clinic-based health screening to community-based disease monitoring, evaluation of out-of-hours triage services to provincial psychiatric care pathways model and finally, national legislation of core measures for children's healthcare insurance. Fundamental concepts of validity, reliability, and generalizability as applicable to qualitative research are then addressed with an update on the current views and controversies. The essence of qualitative research is to make sense of and recognize patterns among words in order to build up a meaningful picture without compromising its richness and dimensionality.
Reliability is the degree to which an assessment tool produces stable and consistent results. The obtained correlation coefficient would indicate the stability of the scores. Inter-rater reliability is especially useful when judgments can be considered relatively subjective. Thus, the use of this type of reliability would probably be more likely when evaluating artwork as opposed to math problems. Validity refers to how well a test measures what it is purported to measure.
By Dr. 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.
PDF | This paper clearly explains the concepts of reliability and accurately to explain to the audience if their research instruments meet the.