Reliability and validity of research tools

It is also the case that many established measures in psychology work quite well despite lacking face validity. Validity is the amount of systematic or built-in error in questionnaire.

External validity is the extent to which the results of a study can be generalized from a sample to a population.

Methods of reliability

Consider the SAT, used as a predictor of success in college. There has to be more to it, however, because a measure can be extremely reliable but have no validity whatsoever. Various forms and methods of analysing validity and reliability of questionnaire were discussed with the main aim of improving the skills and knowledge of these tests among researchers in developing countries. As an informal example, imagine that you have been dieting for a month. The responsiveness of the measure to change is of interest in many of the applications in health care where improvement in outcomes as a result of treatment is a primary goal of research. It is expected in known-group validity that the construct of depression in the questionnaire will be scored higher among the patients with clinically diagnosed depression than those without the diagnosis. The article observed the importance of validity and reliability tests in research and gave both literary and technical meanings of these tests. This is as true for behavioural and physiological measures as for self-report measures.

Attention to these considerations helps to insure the quality of your measurement and of the data collected for your study. Understanding and Testing Validity Validity refers to the degree to which an instrument accurately measures what it intends to measure.

Types of validity in research

We will turn to why next. Attention to these considerations helps to insure the quality of your measurement and of the data collected for your study. This means that any good measure of intelligence should produce roughly the same scores for this individual next week as it does today. The article observed the importance of validity and reliability tests in research and gave both literary and technical meanings of these tests. Or imagine that a researcher develops a new measure of physical risk taking. Then assess its internal consistency by making a scatterplot to show the split-half correlation even- vs. Proponents of the SAT argue that it is both. But how do researchers know that the scores actually represent the characteristic, especially when it is a construct like intelligence, self-esteem, depression, or working memory capacity?

If they cannot show that they work, they stop using them. F2F and telephone questionnaires are used by interviewers to ask a standard set of questions and record the responses that people give to them.

Cronbach, L. This is a review article which comprehensively explores and describes the validity and reliability of a research instrument with special reference to questionnaire.

reliability and validity in quantitative research

Unlike pre-post tests, no treatment occurs between the first and second administrations of the instrument, in order to test-retest reliability.

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validity and reliability of research instruments