Symbols:Greek/Kappa

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Kappa

The $10$th letter of the Greek alphabet.

Minuscule: $\kappa$
Majuscule: $\Kappa$

The $\LaTeX$ code for \(\kappa\) is \kappa .

The $\LaTeX$ code for \(\Kappa\) is \Kappa .


Kernel

$\kappa$

Used in abstract algebra and other related fields to denote the general kernel of a homomorphism.


Curvature

$\kappa$

Let $C$ be a curve defined by a real function which is twice differentiable.


The curvature of $C$ is the rate of change of turning angle with respect to the arc length of $C$.


The curvature of $C$ is often denoted $\kappa$ (Greek kappa).


Thermal Conductivity

$\kappa$

One of the usual symbols used to denote the thermal conductivity of a substance is $\kappa$.


Its $\LaTeX$ code is \kappa .


Cohen's Kappa Statistic

$\kappa$

Let two observers $A$ and $B$ independently classify each of a set of observations into $2$ or more categories.

Cohen's kappa statistic $\kappa$ is a measure of agreement between $A$ and $B$.


Let there be $N$ observations.

Let $n$ denote the number of agreements over all categories.

Let $p_{\mathrm {obs} } := \dfrac n N$ be the observed proportion of agreements.

Let $p_{\mathrm {exp} }$ denote the expected proportion of agreements over all categories under random assignment, as calculated in the usual manner for a contingency table.

Then:

$\kappa = \dfrac {p_{\mathrm {obs} } - p_{\mathrm {exp} } } {1 - p_{\mathrm {exp} } }$


Its $\LaTeX$ code is \kappa .


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