Symbols:Greek/Kappa
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
.