Kappa
Kappa (κ)
Kappa (pronounced: /ˈkæpə/; uppercase Κ, lowercase κ) is the 10th letter of the Greek alphabet. In the system of Greek numerals, Kappa has a value of 20. It is derived from the Phoenician letter kaph. In the context of medicine, Kappa is often used as a statistical measure in Epidemiology and Biostatistics.
Etymology
The term Kappa originates from the Ancient Greek word 'κάππα', which is derived from the Phoenician word 'kaph'. The Phoenician word means 'palm of the hand', which is the shape the letter was originally drawn in.
Medical Usage
In medical research, the Kappa statistic is used to measure the agreement between two raters who each classify N items into C mutually exclusive categories. The term was first used in this context by Jacob Cohen, a psychologist who introduced the Kappa statistic in 1960.
Cohen's Kappa
Cohen's Kappa (κ) is a statistic which measures inter-rater agreement for qualitative (categorical) items. It is generally thought to be a more robust measure than simple percent agreement calculation, as κ takes into account the agreement occurring by chance.
Related Terms
External links
- Medical encyclopedia article on Kappa
- Wikipedia's article - Kappa
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