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 ffan posted on Wednesday, July 16, 2014 - 2:24 am
Hi,

I am doing a six-group measurement invariance study. I compared the configural model with the fully constrained model, finding out that there is no full measurement invariance. Then I am detecting partial invariance and try to find out which item(s) shows measurement noninvariance by comparing the configural model to a scalar model by freeing an item at a time (altogether I have 21 items), but I keep getting warning messages as follows:

CORRELATION MATRIX (WITH VARIANCES ON THE DIAGONAL)
ITEM21
________

WARNING: THE BIVARIATE TABLE OF ITEM17 AND ITEM8 HAS AN EMPTY CELL.

WARNING: THE BIVARIATE TABLE OF ITEM17 AND ITEM14 HAS AN EMPTY CELL.

WARNING: THE BIVARIATE TABLE OF ITEM17 AND ITEM12 HAS AN EMPTY CELL.


THE MODEL ESTIMATION TERMINATED NORMALLY
THE CHI-SQUARE COMPUTATION COULD NOT BE COMPLETED
BECAUSE OF A SINGULAR MATRIX.

I do not know how I should handle this. Any suggestions would help.

Thanks.
 Bengt O. Muthen posted on Wednesday, July 16, 2014 - 5:18 pm
You want to avoid empty cell situations, so try deleting item 17 which is mentioned in all 3 messages.
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