multivariate analysisibg.colorado.edu/workshop2008/cdrom/scriptsi/maes/...e1 e4e2 e3 p1 p4 p3 p2 e...
TRANSCRIPT
![Page 1: Multivariate Analysisibg.colorado.edu/workshop2008/cdrom/ScriptsI/maes/...E1 E4E2 E3 P1 P4 P3 P2 e 11 e 22 e 33 e 44 0 0 0 0 00 0 0 0 0 0 0 * e 11 e 22 e 33 e 44 0 0 0 0 00 0 0 0 0](https://reader035.vdocuments.mx/reader035/viewer/2022071600/613d10d984584d0a6f5b470b/html5/thumbnails/1.jpg)
Multivariate AnalysisNick Martin, Hermine MaesTC21March 2008
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Practical Example
Dataset: NL-IQ Study6 WAIS-III IQ subtests
var1 = onvolledige tekeningen / picture completionvar2 = woordenschat / vocabularyvar3 = paren associeren / digit spanvar4 = incidenteel leren / incidental learningvar5 = overeenkomsten / similaritiesvar6 = blokpatronen / block design
N MZF: 27, DZF: 70
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Scientific Questions
Are these IQ subtests determined by the same genes [single common genetic factor]?Are there group factors, e.g. verbal versus performance IQ?What is the structure for C and E?
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Outline for the afternoon
Fit ACE CholeskySimplify Cholesky: do we need all sources?
Factor ModelsIndependent Pathway ModelModify IP ModelsCommon Pathway Model
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Files to Copy to your Computer
Faculty/hmaes/a21/maes/multivariate*.rec*.dat*.mxMultivariate-mac.ppt
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Multivariate Questions I
Bivariate Analysis: What are the contributions of genetic and environmental factors to the covariance between two traits?Multivariate Analysis: What are the contributions of genetic and environmental factors to the covariance between more than two traits?
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Phenotypic Cholesky F1
F1 F4F3F2P1
P4P3P2
f11
f41
f31
f21
F1 F2
f11
P1t1
1 1
P2t1
f21
F31
P3t1
F41
P4t1
f31 f41
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Phenotypic Cholesky F2
F1 F4F3F2P1
P4P3P2
f11
f41
f31
f21 f22
f42
f32
0F1 F2
f22
P1t1
1 1
P2t1
F31
P3t1
F41
P4t1
f32 f42
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Phenotypic Cholesky
F1 F4F3F2P1
P4P3P2
f11
f41
f31
f21 f22
f33
f42
f32
f43
000
F1 F2
P1t1
1 1
P2t1
F3
f33
1
P3t1
F41
P4t1
f43
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Phenotypic Cholesky
F1 F4F3F2P1
P4P3P2
f11
f41
f31
f21 f22
f33
f42
f32
f43 f44
0
000
0 0F1 F2
P1t1
1 1
P2t1
F31
P3t1
F4
f44
1
P4t1
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Cholesky Decomposition
f11 f41f31f21
f22
f33
f42f32
f43
f44
0
0000
0
F1 F4F3F2P1
P4P3P2
f11
f41
f31
f21 f22
f33
f42
f32
f43 f44
0
000
0 0
*F F'
*
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Saturated Model
Use Cholesky decomposition to estimate covariance matrixFully saturatedModel: Cov P = F*F’
F: Lower nvar nvar
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ACE Cholesky
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Practical Example
Dataset: NL-IQ Study6 WAIS-III IQ subtests
var1 = onvolledige tekeningen / picture completionvar2 = woordenschat / vocabularyvar3 = paren associeren / digit spanvar4 = incidenteel leren / incidental learningvar5 = overeenkomsten / similaritiesvar6 = blokpatronen / block design
N MZF: 27, DZF: 70
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Dat Filesiqnlmz.datData NInputvars=18Missing=-1.00Rectangular File=iqnl.recLabels famid zygosage_t1 sex_t1 var1_t1 var2_t1 var3_t1 var4_t1 var5_t1 var6_t1age_t2 sex_t2 var1_t2 var2_t2 var3_t2 var4_t2 var5_t2 var6_t2Select if zygos < 3 ; !select mz'sSelect var1_t1 var2_t1 var3_t1 var4_t1 var5_t1 var6_t1var1_t2 var2_t2 var3_t2 var4_t2 var5_t2 var6_t2 ;
iqnldz.dat....Select if zygos > 2 ; !select dz's....
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MATRIX MThis is a FULL matrix of order 1 by 6
1 2 3 4 5 61 64 65 66 67 68 69
MATRIX XThis is a LOWER TRIANGULAR matrix of order 6 by 6
1 2 3 4 5 61 12 2 33 4 5 64 7 8 9 105 11 12 13 14 156 16 17 18 19 20 21
MATRIX YThis is a LOWER TRIANGULAR matrix of order 6 by 6
1 2 3 4 5 61 222 23 243 25 26 274 28 29 30 315 32 33 34 35 366 37 38 39 40 41 42
MATRIX ZThis is a LOWER TRIANGULAR matrix of order 6 by 6
1 2 3 4 5 61 432 44 453 46 47 484 49 50 51 525 53 54 55 56 576 58 59 60 61 62 63
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Goodness-of-Fit Statistics
Compath
3A IndP
3AE IndP
AE IndP
Indpath
AE Chol
Cholesky
Saturated 7802656.32
0.65.00111222.658912878.97
AICp pdf2
df2df-2LL
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MATRIX MThis is a FULL matrix of order 1 by 6
1 2 3 4 5 61 8.6579 6.5193 8.1509 8.8697 6.9670 7.9140
MATRIX PThis is a computed FULL matrix of order 18 by 6[=S*X_S*Y_S*Z]
VAR1 VAR2 VAR3 VAR4 VAR5 VAR6A1 0.8373 0.0000 0.0000 0.0000 0.0000 0.0000A2 -0.0194 0.8774 0.0000 0.0000 0.0000 0.0000A3 0.1209 0.1590 -0.6408 0.0000 0.0000 0.0000A4 0.3281 0.1001 -0.6566 0.0235 0.0000 0.0000A5 0.1680 0.4917 0.0297 -0.1399 -0.0002 0.0000A6 0.3087 0.3156 -0.2956 -0.7862 -0.0009 -0.0003
C1 -0.2040 0.0000 0.0000 0.0000 0.0000 0.0000C2 -0.2692 0.0045 0.0000 0.0000 0.0000 0.0000C3 0.0586 0.0608 -0.0234 0.0000 0.0000 0.0000C4 0.0552 0.0126 -0.0043 0.0000 0.0000 0.0000C5 -0.5321 -0.1865 0.0724 -0.0001 0.0002 0.0000C6 -0.0294 0.0463 -0.0198 0.0000 0.0000 0.0000
E1 -0.5072 0.0000 0.0000 0.0000 0.0000 0.0000E2 -0.1656 -0.3604 0.0000 0.0000 0.0000 0.0000E3 -0.0630 -0.1009 0.7264 0.0000 0.0000 0.0000E4 0.1751 -0.0590 0.3896 -0.5114 0.0000 0.0000E5 -0.0941 -0.0660 -0.0411 -0.0367 -0.6084 0.0000E6 -0.0978 0.0803 0.0224 -0.0449 -0.0393 -0.2761
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Exercise I
Fit AE Cholesky ModelAE
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Solution I
….Option MultipleEnd
Drop Y 1 1 1 - Y 1 nvar nvarEnd
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Goodness-of-Fit Statistics
AE Comp
3A IndP
3AE IndP
AE IndP
AE Chol
Cholesky
Saturated
1.0213.19122882.09
7802656.32
0.65.00111222.658912878.97
AICp pdf2df2df-2LL
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Phenotypic Single Factor
F1P1
P4P3P2
f11
f41
f31
f21*
f11 f21 f31 f41
F * F'
F1
f11
P1t1
1
P2t1
f21
P3t1 P4t1
f31 f41
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Residual VariancesE1 E4E3E2
P1
P4P3P2
e11
e22
e33
e44
0
000
0 0
00
000
0
*
e11
e22
e33
e44
0
000
0 0
00
000
0
*E E'
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
F11
E11
E41
E31
E21
e11 e44e33e22
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Factor Analysis
Explain covariance by limited number of factorsExploratory / ConfirmatoryModel: Cov P = F*F’ + E*E’
F: Full nvar nfacE: Diag nvar nvar
Model: Cov P = F*I*F’ + E*E’
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Twin Data
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
F11
E11
E41
E31
E21
e11 e44e33e22
f11
P1t2 P2t2
f21
P3t2 P4t2
f31 f41
F11
E11
E41
E31
E21
e11 e44e33e22
?
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Genetic Single Factor
a11
P1t1 P2t1
a21
P3t1 P4t1
a31 a41
A11
E11
E41
E31
E21
e11 e44e33e22
a11
P1t2 P2t2
a21
P3t2 P4t2
a31 a41
A11
E11
E41
E31
E21
e11 e44e33e22
1.0 / 0.5
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Common Environmental Single Factor
P1t1 P2t1 P3t1 P4t1
A11
E11
E41
E31
E21
e11 e44e33e22
P1t2 P2t2 P3t2 P4t2
A11
E11
E41
E31
E21
e11 e44e33e22
1.0 / 0.5
c11 c21 c31 c41
C11
c11 c21 c31 c41
C11
1.0
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Specific Environmental Single Factor
P1t1 P2t1 P3t1 P4t1
A11
E11
E41
E31
E21
e11 e44e33e22
P1t2 P2t2 P3t2 P4t2
A11
E11
E41
E31
E21
e11 e44e33e22
1.0 / 0.5
C11
C11
1.0
e11 e21 e31e41
E11
e11 e21 e31e41
E11
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Single [Common] FactorX: genetic
Full 4 x 1Full nvar x nfac
Y: shared environmentalZ: specific environmental
A1P1
P4P3P2
a11
a41
a31
a21*
a11a21a31a41
X * X'
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Residuals partitioned in ACE
P1t1 P2t1 P3t1 P4t1
A11
E11
E41
E31
E21
e11 e44e33e22
P1t2 P2t2 P3t2 P4t2
A11
E11
E41
E31
E21
e11 e44e33e22
1.0 / 0.5
C11
C11
1.0
E11
E11
C11
c11
A11
a11
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Residual FactorsT: geneticU: shared environmentalV: specific environmental
Diag 4 x 4Diag nvar x nvar E1 E4E3E2
P1
P4P3P2
e11
e22
e33
e44
0
000
0 0
00
000
0
*
e11
e22
e33
e44
0
000
0 0
00
000
0
*V V'
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Independent Pathway Model
P1t1 P2t1 P3t1 P4t1
AC
1
P1t2 P2t2 P3t2 P4t2
AC
1
1.0 / 0.5
CC
1
CC
1
1.0
EC
1
EC
1
C11
E1
1
A11
E2
1
A21
E3
1
A31
E4
1
A41
E1
1
A11
E2
1
A21
E3
1
A31
E4
1
A41
1.0 / 0.5 1.0 / 0.5 1.0 / 0.5 1.0 / 0.5
[X] [Y] [Z]
[T]
[V][U]
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IP
Independent pathwaysBiometric modelDifferent covariance structure for A, C and E
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Independent Pathway IG1: Define matricesCalculationBegin Matrices;X full nvar nfac Free ! common factor genetic path coefficientsY full nvar nfac Free ! common factor shared environment pathsZ full nvar nfac Free ! common factor unique environment pathsT diag nvar nvar Free ! variable specific genetic pathsU diag nvar nvar Free ! variable specific shared env pathsV diag nvar nvar Free ! variable specific residual pathsM full 1 nvar Free ! means
End Matrices;Start …
Begin Algebra;A= X*X' + T*T'; ! additive genetic variance componentsC= Y*Y' + U*U'; ! shared environment variance componentsE= Z*Z' + V*V'; ! nonshared environment variance components
End Algebra;End
indpath.mx
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Independent Pathway IIG2: MZ twins#include iqnlmz.datBegin Matrices = Group 1;Means M | M ;Covariance A+C+E | A+C _
A+C | A+C+E ;Option Rsiduals
End
G3: DZ twins#include iqnldz.datBegin Matrices= Group 1;H full 1 1
End Matrices;Matrix H .5
Means M | M ;Covariance A+C+E | H@A+C _
H@A+C | A+C+E ;Option Rsiduals
End
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Independent Pathway IIIG4: Calculate Standardised SolutionCalculationMatrices = Group 1I Iden nvar nvar
End Matrices;Begin Algebra;R=A+C+E; ! total varianceS=(\sqrt(I.R))~; ! diagonal matrix of standard deviationsP=S*X_ S*Y_ S*Z; ! standardized estimates for common factorsQ=S*T_ S*U_ S*V; ! standardized estimates for spec factors
End Algebra;Labels Row P a1 a2 a3 a4 a5 a6 c1 c2 c3 c4 c5 c6 e1 e2 e3 e4 e5 e6Labels Col P var1 var2 var3 var4 var5 var6Labels Row Q as1 as2 as3 as4 as5 as6 cs1 cs2 cs3 cs4 cs5 cs6 es1 es2
es3 es4 es5 es6Labels Col Q var1 var2 var3 var4 var5 var6Options NDecimals=4
End
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Independent Pathway Model
P1t1 P2t1 P3t1 P4t1
AC
1
P1t2 P2t2 P3t2 P4t2
AC
1
1.0 / 0.5
CC
1
CC
1
1.0
EC
1
EC
1
C11
E1
1
A11
E2
1
A21
E3
1
A31
E4
1
A41
E1
1
A11
E2
1
A21
E3
1
A31
E4
1
A41
1.0 / 0.5 1.0 / 0.5 1.0 / 0.5 1.0 / 0.5
[X] [Y] [Z]
[T]
[V][U]
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Path Diagram to Matrices
#define nvar 6#define nfac 1
[V]6 x 6
[U]6 x 6
[T]6 x 6
Residual Factors
[Z]6 x 1
[Y]6 x 1
[X]6 x 1
Common Factors
e2c2a2Variance Component
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MATRIX MThis is a FULL matrix of order 1 by 6
1 2 3 4 5 61 37 38 39 40 41 42
MATRIX TThis is a DIAGONAL matrix of order 6 by 6
1 2 3 4 5 61 192 0 203 0 0 214 0 0 0 225 0 0 0 0 236 0 0 0 0 0 24
MATRIX UThis is a DIAGONAL matrix of order 6 by 6
1 2 3 4 5 61 252 0 263 0 0 274 0 0 0 285 0 0 0 0 296 0 0 0 0 0 30
MATRIX VThis is a DIAGONAL matrix of order 6 by 6
1 2 3 4 5 61 312 0 323 0 0 334 0 0 0 345 0 0 0 0 356 0 0 0 0 0 36
MATRIX XThis is a FULL matrix of order 6 by 1
11 12 23 34 45 56 6
MATRIX YThis is a FULL matrix of order 6 by 1
11 72 83 94 105 116 12
MATRIX ZThis is a FULL matrix of order 6 by 1
11 132 143 154 165 176 18
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Exercise II
Fit AE Independent Pathway ModelAcEcAsEs
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Solution II
Drop Y matrixDrop U matrix
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Goodness-of-Fit Statistics
AE Comp
3A IndP
3AE IndP
.213945.89302924.77AE IndP
AE Chol
Cholesky
Saturated
1.0213.19122882.09
7802656.32
0.65.00111222.658912878.97
AICp pdf2df2df-2LL
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WAIS-III IQ
Verbal IQvar2 = woordenschat / vocabularyvar3 = paren associeren / digit spanvar5 = overeenkomsten / similarities
Performance IQvar1 = onvolledige tekeningen / picture completionvar4 = incidenteel leren / incidental learningvar6 = blokpatronen / block design
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Exercise III
Fit 3AE Independent Pathway ModelAc
A1 loading on all 6 varsA2 loading on vars 1, 4, 6A3 loading on vars 2, 3, 5
EcEs
Drop Ec
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Solution III
X Full nvar 3Specify X
1 7 02 0 103 0 114 8 05 0 126 9 0
Group 4O= S*XP= S*Y_S*Z;
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Goodness-of-Fit Statistics
AE Comp
3A IndP
.883928.89302907.043AE IndP
.213945.89302924.77AE IndP
AE Chol
Cholesky
Saturated
1.0213.19122882.09
7802656.32
0.65.00111222.658912878.97
AICp pdf2df2df-2LL
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Goodness-of-Fit Statistics
AE Comp
.004579.69362958.633A IndP
.883928.89302907.043AE IndP
.213945.89302924.77AE IndP
AE Chol
Cholesky
Saturated
1.0213.19122882.09
7802656.32
0.65.00111222.658912878.97
AICp pdf2df2df-2LL
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Phenotypic Single Factor
F1P1
P4P3P2
f11
f41
f31
f21*
f11 f21 f31 f41
F * F'
F1
f11
P1t1
1
P2t1
f21
P3t1 P4t1
f31 f41
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Latent Phenotype
F1
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
E1
C1
A1
eca
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Twin Data
F1
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
E1
C1
A1
eca
F1
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
E1
C1
A1
eca
1.0 / 0.5 1.0
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Factor on Latent PhenotypeF1
P1
P4P3P2
f11
f41
f31
f21* f11 f21 f31 f41
F * F'
a a* *
X X'* *
F & X X'*( )=
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Common Pathway Model
F1
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
E1
C1
A1
eca
F1
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
E1
C1
A1
eca
1.0 / 0.5 1.0
C11
E1
1
A11
E2
1
A21
E3
1
A31
E4
1
A41
E1
1
A11
E2
1
A21
E3
1
A31
E4
1
A41
1.0 / 0.5 1.0 / 0.5 1.0 / 0.5 1.0 / 0.5
[T]
[V][U]
[X] [Y] [Z]
[F]
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Common Pathway Model IG1: Define matricesCalculationBegin Matrices;X full nfac nfac Free ! latent factor genetic path coefficientY full nfac nfac Free ! latent factor shared environment pathZ full nfac nfac Free ! latent factor unique environment pathT diag nvar nvar Free ! variable specific genetic pathsU diag nvar nvar Free ! variable specific shared env pathsV diag nvar nvar Free ! variable specific residual pathsF full nvar nfac Free ! loadings of variables on latent factorI Iden 2 2M full 1 nvar Free ! means
End Matrices;Start ..
Begin Algebra;A= F&(X*X') + T*T'; ! genetic variance componentsC= F&(Y*Y') + U*U'; ! shared environment variance componentsE= F&(Z*Z') + V*V'; ! nonshared environment variance componentsL= X*X' + Y*Y' + Z*Z'; ! variance of latent factor
End Algebra;End
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Common Pathway IIG4: Constrain variance of latent factor to 1ConstraintBegin Matrices;L computed =L1I unit 1 1
End Matrices;Constraint L = I ;
End
G5: Calculate Standardised SolutionCalculationMatrices = Group 1D Iden nvar nvar
End Matrices;Begin Algebra;R=A+C+E; ! total varianceS=(\sqrt(D.R))~; ! diagonal matrix of standard deviationsP=S*F; ! standardized estimates for loadings on FQ=S*T_ S*U_ S*V; ! standardized estimates for specific factors
End Algebra;Options NDecimals=4
End
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CP
Common pathwayPsychometric modelSame covariance structure for A, C and E
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Common Pathway Model
F1
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
E1
C1
A1
eca
F1
f11
P1t1 P2t1
f21
P3t1 P4t1
f31 f41
E1
C1
A1
eca
1.0 / 0.5 1.0
C11
E1
1
A11
E2
1
A21
E3
1
A31
E4
1
A41
E1
1
A11
E2
1
A21
E3
1
A31
E4
1
A41
1.0 / 0.5 1.0 / 0.5 1.0 / 0.5 1.0 / 0.5
[T]
[V][U]
[X] [Y] [Z]
[F]
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Path Diagram to Matrices
#define nvar 6#define nfac 1
[V]6 x 6
[U]6 x 6
[T]6 x 6
Residual Factors
[F]6 x 1
[Z]1 x 1
[Y]1 x 1
[X]1 x 1
Common Factor
e2c2a2Variance Component
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MATRIX MThis is a FULL matrix of order 1 by 6
1 2 3 4 5 61 28 29 30 31 32 33
MATRIX TThis is a DIAGONAL matrix of order 6 by 6
1 2 3 4 5 61 42 0 53 0 0 64 0 0 0 75 0 0 0 0 86 0 0 0 0 0 9
MATRIX UThis is a DIAGONAL matrix of order 6 by 6
1 2 3 4 5 61 102 0 113 0 0 124 0 0 0 135 0 0 0 0 146 0 0 0 0 0 15
MATRIX VThis is a DIAGONAL matrix of order 6 by 6
1 2 3 4 5 61 162 0 173 0 0 184 0 0 0 195 0 0 0 0 206 0 0 0 0 0 21
MATRIX XThis is a FULL matrix of order 1 by 1
11 1
MATRIX YThis is a FULL matrix of order 1 by 1
11 2
MATRIX ZThis is a FULL matrix of order 1 by 1
11 3
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Exercise IV
Fit AE Common Pathway ModelAcEcAsEs
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Goodness-of-Fit Statistics
.0026128.79353007.69AE Comp
.004579.69362958.633A IndP
.883928.89302907.043AE IndP
.213945.89302924.77AE IndP
AE Chol
Cholesky
Saturated
1.0213.19122882.09
7802656.32
0.65.00111222.658912878.97
AICp pdf2df2df-2LL
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Independent Pathway ModelBiometric Factor ModelLoadings differ for genetic and environmental common factors
Common Pathway ModelPsychometric Factor ModelLoadings equal for genetic and environmental common factor
Summary
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Pathway Model
F2
P1t1 P2t1 P3t1 P4t1
a21
f11
P1t2 P2t2
f21
P3t2 P4t2
f31 f41
1.0 / 0.5
E1
A1
E2 E3 E4 E1
1
A11
E51
E61
1.0 / 0.5[T]
[Z]
[F]
P5t2 P6t2P6t1P5t1
F1
f11 f21 f31 f41 f51 f1
F3
f61
E11
C11
A11
E21
C21
A21
F1
E1
C1
A1
eca
E31
C31
A31
a32a31 a33a11 a22
1
f51 f61
1.0
1
111C1
1C1
1.0 1[U]
[Y][X]
F2 F3
[V]
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Common Pathway Model
1
F2
f11
P1t1 P2t1 P3t1 P4t1
f41 f11
P1t2 P2t2
f21
P3t2 P4t2
f31 f41
1.0 / 0.5
E1
A1
E2 E3 E4 E1
1
A11
E51
E61
1.0 / 0.5[T]
[Z]
[F]
P5t2 P6t2P6t1P5t1
f61
F1
f21 f31 f51
F3
E11
C11
A11
E21
C21
A21
F1
E1
C1
A1
eca
E311
A31
a11
1
f51 f61
1.0
1
111C1
1C1
1.0 1[U]
[Y][X]
F2 F3
[V]
C3
1
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Independent Pathway Model
F2
P1t1 P2t1 P3t1 P4t1
f11
P1t2 P2t2
f21
P3t2 P4t2
f31 f41
1.0 / 0.5
E1
A1
E2 E3 E4 E1
1
A11
E51
E61
1.0 / 0.5[T]
[Z]
[F]
P5t2 P6t2P6t1P5t1
F1
f11 f21 f31 f41 f51 f1
F3
f61
E11
C11
A11
E21
C21
A21
F1
E1
C1
A1
111
E31
C31
A31
1 11
1
f51 f61
1.0
1
111C1
1C1
1.0 1[U]
[Y][X]
F2 F3
[V]