Stability Stress and Adaptation

Multi-Location Mean Yield Calculator

(Genotype Performance Across Environments)

Formula Used:

Mean Yield = Σ(Yield at each location) ÷ Number of locations

Yield at Location 1: Yield at Location 2: Yield at Location 3: Yield at Location 4 (optional): Yield at Location 5 (optional):

Result:

Multi-location Mean Yield: —

February 23, 2026

Genotype × Environment Interaction Index

(Stability & Adaptability Indicator)

Input Data

Genotype Yield at Environment 1: Genotype Yield at Environment 2: Genotype Yield at Environment 3: Genotype Yield at Environment 4 (optional):

Environment Means (Ȳⱼ) – same order: Grand Mean (Ȳ):

Result:

G×E Interaction Index: —

February 23, 2026

Regression Coefficient (bᵢ) Calculator

(Eberhart & Russell Stability Analysis)

Formula Used:

bᵢ = Σ(I × Y) ÷ Σ(I²)

Input Data

Environment 1: Yield (Y₁) and Index (I₁) Environment 2: Yield (Y₂) and Index (I₂) Environment 3: Yield (Y₃) and Index (I₃) Environment 4 (optional): Yield (Y₄) and Index (I₄)

Result:

Regression Coefficient (bᵢ): —

Interpretation: —

February 23, 2026

Deviation from regression (S²di)

Deviation from Regression (S²dᵢ)

Eberhart & Russell Stability Model

Formula:
S²dᵢ = Σ(Y − Ŷ)² ÷ (n − 2)

Overall Mean Yield (Ȳ) Regression Coefficient (bᵢ) Environment 1 – Yield (Y₁) Environment 1 – Index (I₁) Environment 2 – Yield (Y₂) Environment 2 – Index (I₂) Environment 3 – Yield (Y₃) Environment 3 – Index (I₃) Environment 4 – Yield (optional) Environment 4 – Index (optional)

S²dᵢ: —

Interpretation: —

February 23, 2026