Warning in multilevel regression anal... PreviousNext
Mplus Discussion > Multilevel Data/Complex Sample >
Message/Author
 Lynn posted on Wednesday, February 17, 2010 - 2:05 am
Dear Dr. Muthen,

I am using multilevel regression analysis, the model running normally except a warning. Can i fix it and can this results be used?

Below is warning message that I had

WARNING: THE MLR STANDARD ERRORS COULD NOT BE COMPUTED. THE MLF STANDARD ERRORS WERE COMPUTED INSTEAD. THE MLR CONDITION NUMBER IS -0.433D-04. PROBLEM INVOLVING PARAMETER 24 (PSI, S1). THIS MAY BE DUE TO NEAR SINGULARITY OF THE RANDOM EFFECT VARIANCE/COVARIANCE OR INCOMPLETE CONVERGENCE.

The syntax are:

VARIABLE:
NAMES ARE ......
USEVARIABLES ARE y1 y2 x1 x2 m cluster;
WITHIN = x1 x2;
BETWEEN = m;
CLUSTER IS cluster;
CENTERING = GRANDMEAN (x1 x2);

ANALYSIS:
TYPE = TWOLEVEL RANDOM;

MODEL:
%WITHIN%
s1 | y1 ON x1;
s2 | y1 ON x2;
s3 | y2 ON x1;
s4 | y2 ON x2;

%BETWEEN%
s1-s4 y1 y2 ON m;

OUTPUT: TECH1 TECH8 ;


Thank you very much.

Kitkat
 Linda K. Muthen posted on Wednesday, February 17, 2010 - 11:08 am
If you find standard errors in your results, they can be trusted. The problem is most likely due to the variances of the random slopes being close to zero or correlations of one between some of the random slopes. Check the results for zero variances and TECH4 for correlations of one.
 Mihyun Park posted on Wednesday, May 04, 2011 - 9:10 am
Dear Dr. Linda

I had following warning message. I can't understand well about that.
Can you tell me more about that?

THE MODEL ESTIMATION TERMINATED NORMALLY

WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IN GROUP MALE
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 F2.
 Linda K. Muthen posted on Wednesday, May 04, 2011 - 11:25 am
f2 has either a negative variance, a correlation greater or equal to one with another variable, or is linearly related to 2 or more variables. Check TECH4.
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