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Mplus Discussion > Multilevel Data/Complex Sample >
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 Edward Mak posted on Monday, July 21, 2008 - 6:22 am
Dear Muthen,
I have got the following error message. how could I deal with it?
Thank you very much.


two level CFA

*** FATAL ERROR

THE SAMPLE BETWEEN COVARIANCE MATRIX COULD NOT BE INVERTED. THIS CAN
OCCUR IF A VARIABLE HAS NO VARIATION, OR IF TWO VARIABLES ARE PERFECTLY
CORRELATED, OR IF THE NUMBER OF CLUSTERS IS NOT GREATER THAN THE NUMBER
OF VARIABLES. CHECK YOUR DATA. THE PROBLEM IS DUE TO:

NUMBER OF VARIABLES : 62
NUMBER OF CLUSTERS : 39
 Linda K. Muthen posted on Monday, July 21, 2008 - 5:44 pm
You need to have more clusters than variables. You will need to cut down the size of your model.
 Edward Mak posted on Tuesday, July 22, 2008 - 12:53 am
Dear Linda,
Thank you very much.
Any other methods?

Edward
 Linda K. Muthen posted on Tuesday, July 22, 2008 - 1:49 pm
I don't know of any methods where you can take clustering into account when you have more variables than clusters.
 Edward Mak posted on Wednesday, July 23, 2008 - 12:02 pm
Dear Linda,
Thank you very much.

Edward
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