Dictionary > Reliability coefficient

Reliability coefficient

Definition
noun
(statistics) A quantitative expression of the reliability or consistency in the measurement of test scores, for example, in test-retest reliability, or in equivalent-form reliability.
Supplement
The symbol for reliability coefficient is letter r. A reliability value of 0.00 means absence of reliability whereas value of 1.00 means perfect reliability. An acceptable reliability coefficient must not be below 0.90, less than this value indicates inadequate reliability. For instance, r =.90 on a test means that 90% of the test score is accurate while the remaining 10% consists of standard error. If the r=0.6, it means that only 60% of the test score is reliable and the other 40% may be caused by an error.
Thus, the higher the reliability coefficient is, the lower the standard error is. The lower the standard error is, the more reliable the test scores are.
See also: test-retest reliability, equivalent-form reliability.


You will also like...

Biological Viruses
Biological Viruses

Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...

Chemical composition of the body
Chemical Composition of the Body

The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

DNA molecule
Genetic Control – On and Off Genes

Genes are the blueprint of our bodies, a blueprint that creates a variety of proteins essential to any organism's surviv..

New Zealand Fauna
New Zealand’s Unique Fauna

Meet some of New Zealand's unique fauna, including endemic insects, frogs, reptiles, birds, and mammals, and investigate..

Types and Causes of Brain Damage
Types and Causes of Brain Damage

This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

Crossing Over and Genetic Diversity
Inheritance and Probability

Gregor Mendel, an Austrian monk, is most famous in this field for his study of the phenotype of pea plants, including ..

Related Articles...

No related articles found

See all Related Topics