The Higher-Order Model Imposes a Proportionality Constraint: That is Why the Bifactor Model Tends to Fit Better

Supplementary Material

Table S1

Simulated Correlation Matrix: Proportionality Constraint Satisfied 1


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.524

1.000








a3

.500

.475

1.000







b1

.342

.325

.310

1.000






b2

.342

.325

.310

.500

1.000





b3

.342

.325

.310

.500

.500

1.000




c1

.342

.325

.310

.350

.350

.350

1.000



c2

.342

.325

.310

.350

.350

.350

.500

1.000


c3

.342

.325

.310

.350

.350

.350

.500

.500

1.000




Table S2

Simulated Correlation Matrix: Proportionality Constraint Violated 1


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.550

1.000








a3

.500

.451

1.000







b1

.342

.325

.310

1.000






b2

.342

.325

.310

.500

1.000





b3

.342

.325

.310

.500

.500

1.000




c1

.342

.325

.310

.350

.350

.350

1.000



c2

.342

.325

.310

.350

.350

.350

.500

1.000


c3

.342

.325

.310

.350

.350

.350

.500

.500

1.000






Table S3

Simulated Correlation Matrix: Proportionality Constraint Violated 2


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.550

1.000








a3

.500

.451

1.000







b1

.324

.325

.325

1.000






b2

.324

.325

.325

.500

1.000





b3

.324

.325

.325

.500

.500

1.000




c1

.324

.325

.325

.350

.350

.350

1.000



c2

.324

.325

.325

.350

.350

.350

.500

1.000


c3

.324

.325

.325

.350

.350

.350

.500

.500

1.000






Table S4

Simulated Correlation Matrix: Proportionality Constraint Violated 3


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.576

1.000








a3

.500

.428

1.000







b1

.324

.325

.325

1.000






b2

.324

.325

.325

.500

1.000





b3

.324

.325

.325

.500

.500

1.000




c1

.324

.325

.325

.350

.350

.350

1.000



c2

.324

.325

.325

.350

.350

.350

.500

1.000


c3

.324

.325

.325

.350

.350

.350

.500

.500

1.000






Table S5

Simulated Correlation Matrix: Proportionality Constraint Violated 4


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.576

1.000








a3

.500

.428

1.000







b1

.308

.325

.341

1.000






b2

.308

.325

.341

.500

1.000





b3

.308

.325

.341

.500

.500

1.000




c1

.308

.325

.341

.350

.350

.350

1.000



c2

.308

.325

.341

.350

.350

.350

.500

1.000


c3

.308

.325

.341

.350

.350

.350

.500

.500

1.000






Table S6

Simulated Correlation Matrix: Proportionality Constraint Violated 5


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.605

1.000








a3

.500

.406

1.000







b1

.308

.325

.341

1.000






b2

.308

.325

.341

.500

1.000





b3

.308

.325

.341

.500

.500

1.000




c1

.308

.325

.341

.350

.350

.350

1.000



c2

.308

.325

.341

.350

.350

.350

.500

1.000


c3

.308

.325

.341

.350

.350

.350

.500

.500

1.000






Table S7

Simulated Correlation Matrix: Proportionality Constraint Violated 6


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.605

1.000








a3

.500

.406

1.000







b1

.308

.325

.341

1.000






b2

.308

.325

.341

.550

1.000





b3

.308

.325

.341

.500

.451

1.000




c1

.308

.325

.341

.350

.350

.350

1.000



c2

.308

.325

.341

.350

.350

.350

.500

1.000


c3

.308

.325

.341

.350

.350

.350

.500

.500

1.000






Table S8

Simulated Correlation Matrix: Proportionality Constraint Violated 7


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.605

1.000








a3

.500

.406

1.000







b1

.308

.325

.341

1.000






b2

.308

.325

.341

.576

1.000





b3

.308

.325

.341

.500

.428

1.000




c1

.308

.325

.341

.350

.350

.350

1.000



c2

.308

.325

.341

.350

.350

.350

.500

1.000


c3

.308

.325

.341

.350

.350

.350

.500

.500

1.000






Table S9

Simulated Correlation Matrix: Proportionality Constraint Violated 8


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.605

1.000








a3

.500

.406

1.000







b1

.308

.325

.341

1.000






b2

.308

.325

.341

.605

1.000





b3

.308

.325

.341

.500

.406

1.000




c1

.308

.325

.341

.350

.350

.350

1.000



c2

.308

.325

.341

.350

.350

.350

.500

1.000


c3

.308

.325

.341

.350

.350

.350

.500

.500

1.000






Table S10

Simulated Correlation Matrix: Proportionality Constraint Violated 9


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.605

1.000








a3

.500

.406

1.000







b1

.308

.325

.341

1.000






b2

.308

.325

.341

.605

1.000





b3

.308

.325

.341

.500

.406

1.000




c1

.308

.325

.341

.350

.350

.350

1.000



c2

.308

.325

.341

.350

.350

.350

.550

1.000


c3

.308

.325

.341

.350

.350

.350

.500

.451

1.000






Table S11

Simulated Correlation Matrix: Proportionality Constraint Violated 10


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.605

1.000








a3

.500

.406

1.000







b1

.308

.325

.341

1.000






b2

.308

.325

.341

.605

1.000





b3

.308

.325

.341

.500

.406

1.000




c1

.308

.325

.341

.350

.350

.350

1.000



c2

.308

.325

.341

.350

.350

.350

.576

1.000


c3

.308

.325

.341

.350

.350

.350

.500

.428

1.000






Table S12

Simulated Correlation Matrix: Proportionality Constraint Violated 11


a1

a2

a3

b1

b2

b3

c1

c2

c3

a1

1.000









a2

.605

1.000








a3

.500

.406

1.000







b1

.308

.325

.341

1.000






b2

.308

.325

.341

.605

1.000





b3

.308

.325

.341

.500

.406

1.000




c1

.308

.325

.341

.350

.350

.350

1.000



c2

.308

.325

.341

.350

.350

.350

.605

1.000


c3

.308

.325

.341

.350

.350

.350

.500

.406

1.000





7