Krippendorff’s Alpha

Krippendorff’s alpha (α) is a general statistical measure of variable-specific agreement among observers, measuring devices, or coders of data, designed to indicate their reliability. As a general measure, it is applicable to data on various levels of measurement (metrics) and embraces several known coefficients as special cases. As a statistical measure, it maps samples from a population of data into a single chance-corrected coefficient that indicates the extent to which the population of data can be relied upon or be trusted in subsequent analyses. This entry equates reliability with the replicability of the data-generating process, measured by the agreement on what the data in question refer to or mean. Typical applications of α are content analyses where volumes of text need to be read and ...

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