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If a parameter is not free by default, when the parameter is mentioned in
the MODEL command, it is free at the default starting value unless
another starting value is specified using the asterisk (*) followed by a
number or the parameter is fixed using the @ symbol followed by a
number. The exception to this is that variances and residual variances
for latent response variables corresponding to categorical observed
dependent variables cannot be free in the Delta parameterization. They
can be free in the Theta parameterization. In the Theta parameterization,
scale factors for latent response variables corresponding to categorical
observed dependent variables cannot be free. They can be free in the
Delta parameterization.
GENERAL DEFAULTS
Following are the default starting values:
Means/intercepts of continuous and 0 or sample mean
censored observed variables depending on the
analysis
Means/intercepts of count observed variables 0
Thresholds of categorical observed variables 0 or determined by the
sample proportions
depending on the
analysis
Variances/residual variances of .05 or 1 depending on
continuous latent variables the analysis
Variances/residual variances of .5 of the sample
continuous and censored observed variables variance
Variances/residual variances of 1
latent response variables for categorical
observed variables
Scale factors 1
Loadings for indicators of continuous 1
latent variables
All other parameters 0
For situations where starting values depend on the analysis, the starting
values can be found using the TECH1 option of the OUTPUT command. |
