The program FULL2SYM.EXE is a DOS utility which reads a covariance matrix or correlation
matrix stored in full form and then converts it to lower triangular form required for LISREL or SIMPLIS input.
Researchers often use software packages such as SAS or SPSS to create a correlation matrix.
The output of this matrix is in full form as shown in the example below (NI=7 variables)
FULL.COR
1.0000 0.4158 -.0015 0.1738 -.0373 0.5406 0.3139 0.4158 1.0000 0.1114 0.5183 0.2078 0.4719 0.3622 -.0015 0.1114 1.0000 0.2058 -.0384 -.1065 -.0339 0.1738 0.5183 0.2058 1.0000 0.0941 0.2854 0.1897 -.0373 0.2078 -.0384 0.0941 1.0000 0.1087 0.2098 0.5406 0.4719 -.1065 0.2854 0.1087 1.0000 0.2449 0.3139 0.3622 -.0339 0.1897 0.2098 0.2449 1.0000
FULL2SYM converts this matrix to lower triangular form as shown in the example below:
SYMM.COR
1.00000 0.41580 1.00000-0.00150 0.11140 1.00000 0.17380 0.51830 0.20580 1.00000-0.03730 0.20780 -0.03840 0.09410 1.00000 0.54060 0.47190 -0.10650 0.28540 0.10870 1.00000 0.31390 0.36220 -0.03390 0.18970 0.20980 0.24490 1.00000
This file can subsequently be read by LISREL as illustrated in the example below using
SIMPLIS syntax.
CFA.SPL
Title
CONFIRMATORY FACTOR ANALYSIS
Observed variables:
SIZE PRCT CRED INFO DSPN
COMS SIMS
correlation matrix from file SYMM.COR
sample size=200
latent variables:
eta1 eta2
Relationships:
SIZE
PRCT CRED = eta1
INFO DSPN COMS SIMS = eta2
End of problem
Procedure:
At the dos prompt type in:
FULL2SYM
The program will prompt the user for the following information:
