Julia D posted on Tuesday, January 19, 2016 - 9:37 am
Hi, I am attempting to estimate a cubic (single group) model for a set of longitudinal data before moving on to conduct an LCGA.
I am receiving a warning in the output file: WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IS NOT POSITIVE DEFINITE. THIS COULD INDICATE A NEGATIVE VARIANCE/RESIDUAL VARIANCE FOR A LATENT VARIABLE, A CORRELATION GREATER OR EQUAL TO ONE BETWEEN TWO LATENT VARIABLES, OR A LINEAR DEPENDENCY AMONG MORE THAN TWO LATENT VARIABLES. CHECK THE TECH4 OUTPUT FOR MORE INFORMATION. PROBLEM INVOLVING VARIABLE S.
I am relatively new to Mplus and latent variable mixture modeling and am wondering if anyone would be able to help me troubleshoot the issues and identify possible solutions/workarounds? TECH4 output has been generated and can be provided.