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Types of Reliability

Inter-Rater or Inter-Observer Reliability
Inter-Rater or Inter-Observer Reliability

Inter-rater reliability is one of the best ways to estimate reliability when your measure is an observation. However, it requires multiple raters or observers. As an alternative, you could look at the correlation of ratings of the same single observer repeated on two different occasions.

Inter-Rater or Inter-Observer Reliability
Inter-Rater or Inter-Observer Reliability

Inter-rater reliability is one of the best ways to estimate reliability when your measure is an observation. However, it requires multiple raters or observers. As an alternative, you could look at the correlation of ratings of the same single observer repeated on two different occasions.

Internal Consistency Reliability
Internal Consistency Reliability

Internal consistency reliability is a measure of how well the items on a test measure the same construct or idea. Learn more about internal consistency reliability from examples and test your knowledge with a quiz.

source: study.com
Parallel-Forms Reliability
Parallel-Forms Reliability

Parallel forms reliability (sometimes termed alternate forms reliability) is one of the three primary classifications of psychometric reliability, along with test-retest reliability and internal consistency reliability. The three categorizations of reliability differ primarily in the differing sources of non-trait or non-true score variability, and secondarily in the number of tests and ...

Test-Retest Reliability
Test-Retest Reliability

Test-Retest Reliability and Confounding Factors. To give an element of quantification to the test-retest reliability, statistical tests factor this into the analysis and generate a number between zero and one, with 1 being a perfect correlation between the test and the retest.

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