Higher-order Multivariate growth curv... PreviousNext
Mplus Discussion > Growth Modeling of Longitudinal Data >
 Kara Thompson posted on Monday, January 07, 2013 - 11:28 am

I am trying to reparameterize a multivariate piecewise growth model (with 3 alcohol use measures) into a higher-order factor of curves model, but I continue to get an error message ...NOT POSITIVE DEFINITE." because one of my first-order latent variables has a negative residual variance, but I am not sure how to fix this.

Thanks. Please find my syntax in a subsequent post
 Kara Thompson posted on Monday, January 07, 2013 - 11:30 am
ib s1b | ...;
ib s2b | ...;
if s1f | ...;
if s2f | ...;
iq s1q | ...;
iq s2q | ...;
itot by if* (1);
itot by iq* (2);
s1tot by s1f* (1);
s1tot by s1q* (2);
s2tot by s2f* (1);
s2tot by s2q* (2);
itot by ib@1;
s1tot by s1b@1;
s2tot by s2b@1;

[iq s1q s2q if s1f s2f ib@0 s1b@0 s2b@0];

itot with s1tot;
itot with s2tot;
s1tot with s2tot;

[itot s1tot s2tot];
 Linda K. Muthen posted on Monday, January 07, 2013 - 12:09 pm
Please send the output and your license number to support@statmodel.com.
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