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Hi there, i'm trying to build a crosslaggedmodel, but the output always says: 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 NAT3. I see in the TECH4 Output, that the correlation of 4 latent variables are >1. What can i do? Thanks 


This often means that too much of the observed variable correlations gets channeled through the factors. That can have two reasons: Crossloadings that should not be fixed at zero or residual covariances that should not be zero. Look for the need to modify that using Modindices. 


Hello! I am new to Mplus and trying to test an autoregressive model with crosslagged effects (5 varibales at three points in time). I get this ERROR: One or more variables have a variance greater than the maximum allowed of 1000000. Check your data and format statement or rescale the variable(s) using the DEFINE command. Do you have any suggestions? Thank you! 


Please send the output, data set, and your license number to support@statmodel.com. 


Good afternoon, I have two questions regarding a three wave two variable cross lagged panel model which I am estimating. My first question is whether I am estimating the model correctly? My model command is as follows: X2 ON X1 Y1; X3 ON X2 Y2; Y2 ON X1 Y1; Y3 ON X2 Y2; Assuming this is correct, I get a double headed arrow in two equations of my results. Moreover, a double headed arrow pointing from X1 to X2 and another double headed arrow pointing from Y1 to Y2. If my model is correct, why would this be? Any information as to what I am doing wrong would be helpful. Thank you always for any information that may be provided. 


Statements look ok but to answer you fully we need to see your output  send to Support along with your license number. 

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