Model

Covariance

Distribution

Volume

Shape

Orientation

1

EII

$\lambda I$

Spherical

Equal

Equal

-

2

VII

${\lambda }_{k}I$

Spherical

Variable

Equal

-

3

EEI

$\lambda A$

Diagonal

Equal

Equal

Coordinate axes

4

VEI

${\lambda }_{k}A$

Diagonal

Variable

Equal

Coordinate axes

5

EVI

$\lambda A_{\kappa }$

Diagonal

Equal

Variable

Coordinate axes

6

VVI

${\lambda }_k{A}_{\kappa }$

Diagonal

Variable

Variable

Coordinate axes

7

EEE

$\lambda DA{D}^{\text{T}}$

Ellipsoidal

Equal

Equal

Equal

8

EVE

$\lambda D{A}_{\kappa }{D}^{\text{T}}$

Ellipsoidal

Equal

Variable

Equal

9

VEE

${\lambda }_{k}DA{D}^{\text{T}}$

Ellipsoidal

Variable

Equal

Equal

10

VVE

${\lambda }_{k}D{A}_{\kappa }{D}^{\text{T}}$

Ellipsoidal

Variable

Variable

Equal

11

EEV

$\lambda D_{k}A{D}_{\kappa }^{\text{T}}$

Ellipsoidal

Equal

Equal

Variable

12

VEV

${\lambda }_k{D}_{k}A{D}_{\kappa }^{\text{T}}$

Ellipsoidal

Variable

Equal

Variable

13

EVV

$\lambda D_k{A}_{\kappa }{D}_{\kappa }^{\text{T}}$

Ellipsoidal

Equal

Variable

Variable

14

VVV

${\lambda }_k{D}_k{A}_{\kappa }{D}_{\kappa }^{\text{T}}$

Ellipsoidal

Variable

Variable

Variable