Parameter: λ12 Identified

Algebraic Equations:

σ11λ1212

Single Door Criterion:

{1} ⊥ {2} | {}

Parameter: λ14 Identified

Algebraic Equations:

σ13σ23λ1412σ33λ1424σ3323σ34,
σ132λ1411σ33λ1414σ3313σ34,
σ12σ13λ1411σ23λ1414σ2313σ24,
σ11σ232λ1414σ23213σ23σ24122σ33λ1412σ24σ3312σ23σ34

Single Door Criterion:

{1} ⊥ {4} | {3}
{1} ⊥ {4} | {2,3}

Instrumental Variable:

2 | {3}

Parameter: λ23 Identified

Algebraic Equations:

σ122λ2312σ1311σ22λ2311σ23

Single Door Criterion:

{2} ⊥ {3,4} | {1}

Parameter: λ34 Identified

Algebraic Equations:

σ13σ23λ3413σ2412σ33λ3412σ34,
σ132λ3413σ1411σ33λ3411σ34,
σ12σ13λ3412σ1411σ23λ3411σ24,
σ12σ14σ2311σ232λ3412σ13σ2411σ23σ24122σ33λ34122σ34

Single Door Criterion:

{3} ⊥ {4} | {1}
{3} ⊥ {4} | {1,2}

Instrumental Variable:

2 | {1}

Parameter: ω11 Identified

Algebraic Equations:

1111

Parameter: ω13 Identified

Algebraic Equations:

σ11σ13σ2211σ12σ23122ω1311σ22ω13

Parameter: ω22 Identified

Algebraic Equations:

σ12211σ2211ω22

Parameter: ω33 Identified

Algebraic Equations:

122σ132σ22+2σ123σ13σ23-2σ11σ122σ232112σ22σ232124σ33+2σ11σ122σ22σ33112σ222σ33124ω33-2σ11σ122σ22ω33112σ222ω33

Parameter: ω44 Identified

Algebraic Equations:

14σ24σ3314σ23σ3413σ24σ3412σ34213σ23σ4412σ33σ4413σ23ω4412σ33ω44,
142σ33+2σ13σ14σ3411σ342132σ4411σ33σ44132ω4411σ33ω44,
142σ2313σ14σ2412σ14σ3411σ24σ3412σ13σ4411σ23σ4412σ13ω4411σ23ω44,
σ142σ232132σ242-2σ12σ14σ24σ3311σ242σ33+2σ12σ13σ24σ34122σ34211σ232σ44122σ33σ4411σ232ω44122σ33ω44

Total Effect of X1 on X3: λ12λ23 Identified

Each Parameter Identified

Total Effect of X1 on X4: λ12λ23λ3414 Identified

Each Parameter Identified

Total Effect of X2 on X4: λ23λ34 Identified

Each Parameter Identified

Back Door Criterion:


{2} ⊥ {3,4} | {1}

Vanishing Ideal


Constraint Set:

σ13σ14σ23132σ2412σ14σ3311σ24σ3312σ13σ3411σ23σ34

All constraints are determinantal

Trek-separation:

{1,2,3} ⊥ {1,3,4} | ({},{1,3})