Friday, 13 May 2016

Nature of reliability

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.

No comments:
Write comments

Theme images by MichaelJay. Powered by Blogger.

Follow by Email

Blog Archive

Social stratification

Definition Social stratification is one of the results of ongoing social processes taking place. Every society is segmented into differen...