Validity and reliability in research methods

Multimedia Product Description The importance of research and evaluation in the park and recreation industry is becoming increasingly evident as agencies are being asked to justify their existence to a variety of stakeholders.

Validity and reliability in research methods

Precision and accuracy Validity [3] of an assessment is the degree to which it measures what it is supposed to measure. This is not the same as reliabilitywhich is the extent to which a measurement gives results that are very consistent.

Within validity, the measurement does not always have to be similar, as it does in reliability. However, just because a measure is reliable, it is not necessarily valid. A test cannot be valid unless it is reliable.

Validity and reliability in research methods

Validity is also dependent on the measurement measuring what it was designed to measure, and not something else instead. There are many different types of validity. Construct validity Construct validity refers to the extent to which operationalizations of a construct e.

It subsumes all other types of validity. For example, the extent to which a test measures intelligence is a question of construct validity.

A measure of intelligence presumes, among other things, that the measure is associated with things it should be associated with convergent validitynot associated with things it should not be associated with discriminant validity.

Validity and reliability in research methods

Such lines of evidence include statistical analyses of the internal structure of the test including the relationships between responses to different test items. They also include relationships between the test and measures of other constructs.

As currently understood, construct validity is not distinct from the support for the substantive theory of the construct that the test is designed to measure.

Reliability (statistics) - Wikipedia

As such, experiments designed to reveal aspects of the causal role of the construct also contribute to constructing validity evidence. For example, does an IQ questionnaire have items covering all areas of intelligence discussed in the scientific literature?

Content validity evidence involves the degree to which the content of the test matches a content domain associated with the construct. For example, a test of the ability to add two numbers should include a range of combinations of digits.

A test with only one-digit numbers, or only even numbers, would not have good coverage of the content domain. Content related evidence typically involves a subject matter expert SME evaluating test items against the test specifications.

Before going to the final administration of questionnaires, the researcher should consult the validity of items against each of the constructs or variables and accordingly modify measurement instruments on the basis of SME's opinion.

Items are chosen so that they comply with the test specification which is drawn up through a thorough examination of the subject domain. The experts will be able to review the items and comment on whether the items cover a representative sample of the behavior domain.

Face validity[ edit ] Face validity is an estimate of whether a test appears to measure a certain criterion; it does not guarantee that the test actually measures phenomena in that domain.

Measures may have high validity, but when the test does not appear to be measuring what it is, it has low face validity.We often think of reliability and validity as separate ideas but, in fact, they're related to each other.

Here, I want to show you two ways you can think about their relationship. Reliability does not imply schwenkreis.com is, a reliable measure that is measuring something consistently is not necessarily measuring what you want to be measured.

All research reports use roughly the same format. It doesn't matter whether you've done a customer satisfaction survey, an employee opinion survey, a health care survey, or a marketing research survey. 1 RESEARCH PARADIGMS: METHODOLOGIES AND COMPATIBLE METHODS Abderrazak Dammak* (“All But Dissertation” (ABD) Doctoral Candidate in TESOL) Abstract.

Research Reliability. This problem relates to whether research results can be applied to a wider group than those who took part in a study. In other words, would similar results be obtained if another group containing different respondents or a different set of data points were used?

Understanding Reliability and Validity in Qualitative Research Abstract The use of reliability and validity are common in quantitative research and now it is.

Social Research Methods - Knowledge Base - Reliability & Validity