Parameter: λ₁₂

Parameter: λ₁₃ Identified

Algebraic Equations:

σ₁₄λ₁₃-σ₃₄,
σ₁₁λ₁₃-σ₁₃

Single Door Criterion:

{1} ⊥ {3} | {}
{1} ⊥ {3} | {4}

Instrumental Variable:

4 | {}

Parameter: λ₁₄

Parameter: ω₁₁ Identified

Algebraic Equations:

-σ₁₁+ω₁₁

Parameter: ω₁₂

Parameter: ω₁₄

Parameter: ω₂₂

Parameter: ω₂₃ Identified

Algebraic Equations:

-σ₁₄σ₂₃+σ₁₂σ₃₄+σ₁₄ω₂₃,
σ₁₂σ₁₃-σ₁₁σ₂₃+σ₁₁ω₂₃

Parameter: ω₃₃ Identified

Algebraic Equations:

-σ₁₄σ₃₃+σ₁₃σ₃₄+σ₁₄ω₃₃,
σ₁₃²-σ₁₁σ₃₃+σ₁₁ω₃₃

Parameter: ω₄₄

Vanishing Ideal

Constraint Set:

σ₁₃σ₁₄-σ₁₁σ₃₄

All constraints are determinantal

Trek-separation:

{1,3} ⊥ {1,4} | ({1},{})