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Reliability index is an attempt to quantitatively assess the reliability of a system using a single numerical value. [1] The set of reliability indices varies depending on the field of engineering, multiple different indices may be used to characterize a single system.
Inter-method reliability assesses the degree to which test scores are consistent when there is a variation in the methods or instruments used. This allows inter-rater reliability to be ruled out. When dealing with forms, it may be termed parallel-forms reliability. [6]
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Reliability engineering, concerned with the ability of a system or component to perform its required functions under stated conditions for a specified time Human reliability in engineered systems; Reliability theory, as a theoretical concept, to explain biological aging and species longevity
The Customer Average Interruption Duration Index (CAIDI) is a reliability index commonly used by electric power utilities. [1] It is related to SAIDI and SAIFI, and is calculated as
The System Average Interruption Frequency Index (SAIFI) is commonly used as a reliability index by electric power utilities. This index measures the average number of times that a system customer experiences an outage during the year or during a given time period. [1] SAIFI is normally calculated on either yearly or monthly basis.
The System Average Interruption Duration Index (SAIDI) [1] is commonly used as a reliability index by electric power utilities.SAIDI is the average cumulative outage duration for each customer served, and is calculated as:
The Customer Average Interruption Frequency Index (CAIFI) [1] is a popular reliability index used in the reliability analysis of an electric power system. [2] It is designed to show trends in customers interrupted and helps to show the number of customers affected out of the whole customer base.