Sigma Index Calculator

squared degree deviation

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σ=12 (high!) • 4v, 3e

σ = 12

Σ (d(i) - d(j))² over edges

σ (L₂)

irr (L₁)

σ ≥ irr²/m (Cauchy-Schwarz)

Variance: σ=12L₂ measureσ = F - 2M₂

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About Sigma Index Calculator

A sigma index calculator computing σ(G) = Σ_{(i,j)∈E} (d(i)-d(j))². Gutman-Togan (2021). L₂ irregularity measure. σ = 0 iff regular. σ = M₁+M₂-2M₂ = F - 2M₂ + M₁ (via Zagreb). More sensitive to degree outliers than Albertson irr. Client-side.

Sigma Index Calculator Features

σ(G)
(dᵢ-dⱼ)²
L₂ irr.
0 iff reg.
Common graphs

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