Parameter: λ12 Identified

Algebraic Equations:

σ11λ1212

Single Door Criterion:

{1} ⊥ {2} | {}

Parameter: λ13 Identified

Algebraic Equations:

σ11λ1313

Single Door Criterion:

{1} ⊥ {3} | {}

Parameter: λ24 Identified

Algebraic Equations:

σ122λ2412σ1411σ22λ2411σ24

Single Door Criterion:

{2} ⊥ {4} | {1}

Parameter: ω11 Identified

Algebraic Equations:

1111

Parameter: ω14 Identified

Algebraic Equations:

σ11σ14σ2211σ12σ24122ω1411σ22ω14

Parameter: ω22 Identified

Algebraic Equations:

σ12211σ2211ω22

Parameter: ω23 Identified

Algebraic Equations:

σ12σ1311σ2311ω23

Parameter: ω33 Identified

Algebraic Equations:

σ13211σ3311ω33

Parameter: ω34 Identified

Algebraic Equations:

13σ14σ2212σ14σ2312σ13σ2411σ23σ24122σ3411σ22σ34122ω3411σ22ω34

Parameter: ω44 Identified

Algebraic Equations:

122σ142σ22+2σ123σ14σ24-2σ11σ122σ242112σ22σ242124σ44+2σ11σ122σ22σ44112σ222σ44124ω44-2σ11σ122σ22ω44112σ222ω44

Total Effect of X1 on X4: λ12λ24 Identified

Each Parameter Identified

Vanishing Ideal

Zero Vanishing Ideal