Relibility validity dissertation

What is reliability?

Validity and reliability in quantitative research ppt

Where to write about reliability and validity in a thesis Understanding reliability vs validity Reliability and validity are closely related, but they mean different things. These questionnaire items or interview questions are part of the measurement procedure. Quality in qualitative studies: The case of validity, reliability and generalization. For example, if we want to measure the construct, intelligence, we need to have a measurement procedure that accurately measures a person's intelligence. Measures to ensure validity of a research include, but not limited to the following points: a Appropriate time scale for the study has to be selected; b Appropriate methodology has to be chosen, taking into account the characteristics of the study; c The most suitable sample method for the study has to be selected; d The respondents must not be pressured in any ways to select specific choices among the answer sets. This assumption, that the variable you are measuring is stable or constant, is central to the concept of reliability. A doctor uses a symptom questionnaire to diagnose a patient with a long-term medical condition. For example, we may choose to use questionnaire items, interview questions, and so forth. New York: Basic Books. Several different doctors use the same questionnaire with the same patient but give different diagnoses. Therefore, the measurement is not valid. The researcher must ensure reliability and validity of the study based on the ability to maintain neutrality, and trustworthiness Golafshani, Validity is harder to assess, but it can be estimated by comparing the results to other relevant data or theory. Search Reliability and Validity Issues of research reliability and validity need to be addressed in methodology chapter in a concise manner.

Since there are many ways of thinking about intelligence e. Quality in qualitative studies: The case of validity, reliability and generalization.

Reliability and validity in research methodology pdf

New York: Basic Books. Golafshani, N. A measurement can be reliable without being valid. How are reliability and validity assessed? What is reliability? Quality in qualitative studies: The case of validity, reliability and generalization. Advances in Nursing Science, 36 2 , E66—E Therefore, the score measured e. If the same result can be consistently achieved by using the same methods under the same circumstances, the measurement is considered reliable. Beyond member-checking: A dialogic approach to the research interview. This measurement procedure should provide an accurate representation of the construct it is measuring if it is to be considered valid. A group of participants take a test designed to measure working memory.

Some variables are more stable constant than others; that is, some change significantly, whilst others are reasonably constant.

The thermometer displays the same temperature every time, so the results are reliable.

reliability and validity in quantitative research

Validity is harder to assess, but it can be estimated by comparing the results to other relevant data or theory. Harvey, L. The qualitative researcher needs to explain how dependability and credibility are assured and in the research methodology and documented in the data that are collected.

Reliability and validity examples

When we examine a construct in a study, we choose one of a number of possible ways to measure that construct [see the section on Constructs in quantitative research , if you are unsure what constructs are, or the difference between constructs and variables]. So what do we mean when we say that a measurement procedure is constant or stable? Where to write about reliability and validity in a thesis Understanding reliability vs validity Reliability and validity are closely related, but they mean different things. 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. The Qualitative Report, 8 4 , — Reliability refers to the extent to which the same answers can be obtained using the same instruments more than one time. This indicates that the questionnaire has low reliability as a measure of the condition.

How do I use these tests of reliability? Beyond member-checking: A dialogic approach to the research interview. In principal, a measurement procedure that is stable or constant should produce the same or nearly the same results if the same individuals and conditions are used.

Nurse researcher, 16 440—

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Reliability and Validity