On Fri, 22 Jan 2010 07:03:07 -0800 (PST), Zidavora Elena
>Does somebody have any suggestions why AMOS provides the following
>message in the output?
>"Notes for Model (Default model)
>Computation of degrees of freedom (Default model)
>Number of distinct sample moments: 55
>Number of distinct parameters to be estimated: 23
>Degrees of freedom (55 - 23): 32
>Result (Default model)
>Iteration limit reached
>The results that follow are therefore incorrect.
>The model is probably unidentified. In order to achieve
>identifiability, it will probably be necessary to impose 1 additional
>Is it possible to have both a positive number of degrees of freedom
>and a model which is unidentified? How can i fix the problem?
>I will really appreciate your help. Thanks.
One key phrase is probably "Iteration limit reached."
I've never used AMOS, but by analogy with its simpler
cousin, factor analysis, I conclude that a solution did
not converge adequately within the given number of steps.
Presumably, you can increase the number of steps by
stating "ITERATIONS=" . However, slow convergence
also seems to indicate that *these* data do not provide
a substantial difference between alternative latent
structures, so that simplifying the model (additional
constraints) may be a good idea even if changing
ITERATIONS lets AMOS crank out a solution.
You might also check your data again for such things
as miscoded data or other natural outliers that might
underlie the difficulty in obtaining a fit.