! Sibling Interaction Model ! CBC data in US twins The following MX script lines were read for group 1 G1: MODEL PARAMETERS CALC NGROUPS=3 BEGIN MATRICES; X LOWER 1 1 FREE ! ADDITIVE GENETIC PATH Y LOWER 1 1 FREE ! SHARED ENVIRONMENT PATH Z LOWER 1 1 FREE ! NON-SHARED ENVIRONMENTAL PATH B SYMM 2 2 ! SIBLING INTERACTION PARAMETER I IDEN 2 2 H FULL 1 1 END MATRICES; !Specify B 0 4 0 ! sibling interaction = 0 MATRIX H .5 BEGIN ALGEBRA; A= X*X' ; C= Y*Y' ; E= Z*Z' ; P= (I-B)~; END ALGEBRA; OPTIONS NO_OUTPUT END The following MX script lines were read for group 2 G2: MALE MZ TWINS IN LARGER FAMILIES DATA NINPUT_VARS=2 NOBSERVATIONS=171 LABELS EXTER1 EXTER2 CMATRIX SYMMETRIC FILE=USCBCMZ.COV MATRICES= GROUP 1 COVARIANCES (P* (A+C+E | A+C _ A+C | A+C+E) * P') / OPTIONS RSIDUAL END The following MX script lines were read for group 3 G3: MALE DZ TWINS IN LARGER FAMILIES DATA NINPUT_VARS=2 NOBSERVATIONS=194 LABELS EXTER1 EXTER2 CMATRIX SYMMETRIC FILE=USCBCDZ.COV MATRICES= GROUP 1 COVARIANCES (P* (A+C+E | H@A+C _ H@A+C | A+C+E) * P') / START .3 ALL START .0 B 1 2 1 OPTIONS NDECIMALS=4 OPTIONS RSIDUAL END PARAMETER SPECIFICATIONS GROUP NUMBER: 2 G2: Male MZ twins in larger families MATRIX A This is a computed FULL matrix of order 1 by 1 It has no free parameters specified MATRIX B This is a SYMMETRIC matrix of order 2 by 2 It has no free parameters specified MATRIX C This is a computed FULL matrix of order 1 by 1 It has no free parameters specified MATRIX E This is a computed FULL matrix of order 1 by 1 It has no free parameters specified MATRIX H This is a FULL matrix of order 1 by 1 It has no free parameters specified MATRIX I This is an IDENTITY matrix of order 2 by 2 MATRIX P This is a computed FULL matrix of order 2 by 2 It has no free parameters specified MATRIX X This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 1 MATRIX Y This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 2 MATRIX Z This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 3 GROUP NUMBER: 3 G3: Male DZ twins in larger families MATRIX A This is a computed FULL matrix of order 1 by 1 It has no free parameters specified MATRIX B This is a SYMMETRIC matrix of order 2 by 2 It has no free parameters specified MATRIX C This is a computed FULL matrix of order 1 by 1 It has no free parameters specified MATRIX E This is a computed FULL matrix of order 1 by 1 It has no free parameters specified MATRIX H This is a FULL matrix of order 1 by 1 It has no free parameters specified MATRIX I This is an IDENTITY matrix of order 2 by 2 MATRIX P This is a computed FULL matrix of order 2 by 2 It has no free parameters specified MATRIX X This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 1 MATRIX Y This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 2 MATRIX Z This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 3 MX PARAMETER ESTIMATES GROUP NUMBER: 2 G2: Male MZ twins in larger families MATRIX A This is a computed FULL matrix of order 1 by 1 [=X*X'] 1 1 0.2572 MATRIX B This is a SYMMETRIC matrix of order 2 by 2 1 2 1 0.0000 2 0.0000 0.0000 MATRIX C This is a computed FULL matrix of order 1 by 1 [=Y*Y'] 1 1 0.4114 MATRIX E This is a computed FULL matrix of order 1 by 1 [=Z*Z'] 1 1 0.1154 MATRIX H This is a FULL matrix of order 1 by 1 1 1 0.5000 MATRIX I This is an IDENTITY matrix of order 2 by 2 MATRIX P This is a computed FULL matrix of order 2 by 2 [=(I-B)~] 1 2 1 1.0000 0.0000 2 0.0000 1.0000 MATRIX X This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 0.5072 MATRIX Y This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 0.6414 MATRIX Z This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 0.3396 OBSERVED COVARIANCE MATRIX EXTER1 EXTER2 EXTER1 0.9230 EXTER2 0.7980 0.9070 EXPECTED COVARIANCE MATRIX EXTER1 EXTER2 EXTER1 0.7840 EXTER2 0.6686 0.7840 RESIDUAL MATRIX EXTER1 EXTER2 EXTER1 0.1390 EXTER2 0.1294 0.1230 Function value of this group: 2.5141 Where the fit function is Maximum Likelihood GROUP NUMBER: 3 G3: Male DZ twins in larger families MATRIX A This is a computed FULL matrix of order 1 by 1 [=X*X'] 1 1 0.2572 MATRIX B This is a SYMMETRIC matrix of order 2 by 2 1 2 1 0.0000 2 0.0000 0.0000 MATRIX C This is a computed FULL matrix of order 1 by 1 [=Y*Y'] 1 1 0.4114 MATRIX E This is a computed FULL matrix of order 1 by 1 [=Z*Z'] 1 1 0.1154 MATRIX H This is a FULL matrix of order 1 by 1 1 1 0.5000 MATRIX I This is an IDENTITY matrix of order 2 by 2 MATRIX P This is a computed FULL matrix of order 2 by 2 [=(I-B)~] 1 2 1 1.0000 0.0000 2 0.0000 1.0000 MATRIX X This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 0.5072 MATRIX Y This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 0.6414 MATRIX Z This is a LOWER TRIANGULAR matrix of order 1 by 1 1 1 0.3396 OBSERVED COVARIANCE MATRIX EXTER1 EXTER2 EXTER1 0.6710 EXTER2 0.4480 0.7000 EXPECTED COVARIANCE MATRIX EXTER1 EXTER2 EXTER1 0.7840 EXTER2 0.5400 0.7840 RESIDUAL MATRIX EXTER1 EXTER2 EXTER1 -0.1130 EXTER2 -0.0920 -0.0840 Function value of this group: 2.4331 Where the fit function is Maximum Likelihood Your model has 3 estimated parameters and 6 Observed statistics Chi-squared fit of model >>>>>>> 4.947 Degrees of freedom >>>>>>>>>>>>> 3 Probability >>>>>>>>>>>>>>>>>>>> 0.176 Akaike's Information Criterion > -1.053 RMSEA >>>>>>>>>>>>>>>>>>>>>>>>>> 0.060 This problem used 0.5% of my workspace Task Time elapsed (DD:HH:MM:SS) Reading script & data 0: 0: 0: 0.05 Execution 0: 0: 0: 0.11 TOTAL 0: 0: 0: 0.16 Total number of warnings issued: 0 ______________________________________________________________________________