1. Reliability refers to the results obtained with an
evaluation instrument and not to the instrument itself.
2. Reliability refers to a type of consistency.
3. Reliability is a necessary but not a sufficient
condition for validity.
4. Reliability merely provides the consistency that
makes validity possible.
5- Reliability is a property of the assessment results
rather than the property of the instrument.
6- It is more appropriate to speak of the reliability
of assessment scores rather than the reliability of an assessment.
7- Reliability refers to the results (scores) of a
test; not the test itself.
8- An estimate of reliability refers to a particular
type of consistency.
·
Consistency
over time. or,
·
Consistency
among raters. or,
·
Consistency
of performance across tasks.
·
Must
have reliability to have validity.
9- A test can measure the same attribute with perfect
consistency and not be valid.
10- Reliability is primarily statistical.
When
estimating reliability, we are trying to determine how much measurement error
is present; the less error, the more reliable the instrument.
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